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 <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/chrono-0.4.26/src/datetime/mod.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>mod.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../chrono/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../chrono/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span>
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 </pre><pre class="rust"><code><span class="comment">// This is a part of Chrono.
 // See README.md and LICENSE.txt for details.

 </span><span class="doccomment">//! ISO 8601 date and time with time zone.

 </span><span class="attribute">#[cfg(feature = <span class="string">&quot;alloc&quot;</span>)]
 </span><span class="kw">extern crate </span>alloc;

 <span class="attribute">#[cfg(all(not(feature = <span class="string">&quot;std&quot;</span>), feature = <span class="string">&quot;alloc&quot;</span>))]
 </span><span class="kw">use </span>alloc::string::{String, ToString};
 <span class="attribute">#[cfg(any(feature = <span class="string">&quot;alloc&quot;</span>, feature = <span class="string">&quot;std&quot;</span>, test))]
 </span><span class="kw">use </span>core::borrow::Borrow;
 <span class="kw">use </span>core::cmp::Ordering;
 <span class="kw">use </span>core::fmt::Write;
 <span class="kw">use </span>core::ops::{Add, AddAssign, Sub, SubAssign};
 <span class="kw">use </span>core::{fmt, hash, str};
 <span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
 </span><span class="kw">use </span>std::string::ToString;
 <span class="attribute">#[cfg(any(feature = <span class="string">&quot;std&quot;</span>, test))]
 </span><span class="kw">use </span>std::time::{SystemTime, UNIX_EPOCH};

 <span class="attribute">#[cfg(any(feature = <span class="string">&quot;alloc&quot;</span>, feature = <span class="string">&quot;std&quot;</span>, test))]
 </span><span class="kw">use </span><span class="kw">crate</span>::format::DelayedFormat;
 <span class="attribute">#[cfg(feature = <span class="string">&quot;unstable-locales&quot;</span>)]
 </span><span class="kw">use </span><span class="kw">crate</span>::format::Locale;
 <span class="kw">use </span><span class="kw">crate</span>::format::{parse, parse_and_remainder, ParseError, ParseResult, Parsed, StrftimeItems};
 <span class="kw">use </span><span class="kw">crate</span>::format::{Fixed, Item};
 <span class="kw">use </span><span class="kw">crate</span>::naive::{Days, IsoWeek, NaiveDate, NaiveDateTime, NaiveTime};
 <span class="attribute">#[cfg(feature = <span class="string">&quot;clock&quot;</span>)]
 </span><span class="kw">use </span><span class="kw">crate</span>::offset::Local;
 <span class="kw">use </span><span class="kw">crate</span>::offset::{FixedOffset, Offset, TimeZone, Utc};
 <span class="kw">use </span><span class="kw">crate</span>::oldtime::Duration <span class="kw">as </span>OldDuration;
 <span class="attribute">#[allow(deprecated)]
 </span><span class="kw">use </span><span class="kw">crate</span>::Date;
 <span class="kw">use </span><span class="kw">crate</span>::Months;
 <span class="kw">use crate</span>::{Datelike, Timelike, Weekday};

 <span class="attribute">#[cfg(feature = <span class="string">&quot;rkyv&quot;</span>)]
 </span><span class="kw">use </span>rkyv::{Archive, Deserialize, Serialize};

 <span class="attribute">#[cfg(feature = <span class="string">&quot;rustc-serialize&quot;</span>)]
 </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">mod </span>rustc_serialize;

 <span class="doccomment">/// documented at re-export site
 </span><span class="attribute">#[cfg(feature = <span class="string">&quot;serde&quot;</span>)]
 </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">mod </span>serde;

 <span class="attribute">#[cfg(test)]
 </span><span class="kw">mod </span>tests;

 <span class="doccomment">/// Specific formatting options for seconds. This may be extended in the
 /// future, so exhaustive matching in external code is not recommended.
 ///
 /// See the `TimeZone::to_rfc3339_opts` function for usage.
 </span><span class="attribute">#[derive(Clone, Copy, Debug, Eq, PartialEq, Hash)]
 </span><span class="kw">pub enum </span>SecondsFormat {
     <span class="doccomment">/// Format whole seconds only, with no decimal point nor subseconds.
     </span>Secs,

     <span class="doccomment">/// Use fixed 3 subsecond digits. This corresponds to
     /// [Fixed::Nanosecond3](format/enum.Fixed.html#variant.Nanosecond3).
     </span>Millis,

     <span class="doccomment">/// Use fixed 6 subsecond digits. This corresponds to
     /// [Fixed::Nanosecond6](format/enum.Fixed.html#variant.Nanosecond6).
     </span>Micros,

     <span class="doccomment">/// Use fixed 9 subsecond digits. This corresponds to
     /// [Fixed::Nanosecond9](format/enum.Fixed.html#variant.Nanosecond9).
     </span>Nanos,

     <span class="doccomment">/// Automatically select one of `Secs`, `Millis`, `Micros`, or `Nanos` to
     /// display all available non-zero sub-second digits.  This corresponds to
     /// [Fixed::Nanosecond](format/enum.Fixed.html#variant.Nanosecond).
     </span>AutoSi,

     <span class="comment">// Do not match against this.
     </span><span class="attribute">#[doc(hidden)]
     </span>__NonExhaustive,
 }

 <span class="doccomment">/// ISO 8601 combined date and time with time zone.
 ///
 /// There are some constructors implemented here (the `from_*` methods), but
 /// the general-purpose constructors are all via the methods on the
 /// [`TimeZone`](./offset/trait.TimeZone.html) implementations.
 </span><span class="attribute">#[derive(Clone)]
 #[cfg_attr(feature = <span class="string">&quot;rkyv&quot;</span>, derive(Archive, Deserialize, Serialize))]
 </span><span class="kw">pub struct </span>DateTime&lt;Tz: TimeZone&gt; {
     datetime: NaiveDateTime,
     offset: Tz::Offset,
 }

 <span class="doccomment">/// The minimum possible `DateTime&lt;Utc&gt;`.
 </span><span class="attribute">#[deprecated(since = <span class="string">&quot;0.4.20&quot;</span>, note = <span class="string">&quot;Use DateTime::MIN_UTC instead&quot;</span>)]
 </span><span class="kw">pub const </span>MIN_DATETIME: DateTime&lt;Utc&gt; = DateTime::&lt;Utc&gt;::MIN_UTC;
 <span class="doccomment">/// The maximum possible `DateTime&lt;Utc&gt;`.
 </span><span class="attribute">#[deprecated(since = <span class="string">&quot;0.4.20&quot;</span>, note = <span class="string">&quot;Use DateTime::MAX_UTC instead&quot;</span>)]
 </span><span class="kw">pub const </span>MAX_DATETIME: DateTime&lt;Utc&gt; = DateTime::&lt;Utc&gt;::MAX_UTC;

 <span class="kw">impl</span>&lt;Tz: TimeZone&gt; DateTime&lt;Tz&gt; {
     <span class="doccomment">/// Makes a new `DateTime` with given *UTC* datetime and offset.
     /// The local datetime should be constructed via the `TimeZone` trait.
     ///
     /// # Example
     ///
     /// ```
     /// use chrono::{DateTime, TimeZone, NaiveDateTime, Utc};
     ///
     /// let dt = DateTime::&lt;Utc&gt;::from_utc(NaiveDateTime::from_timestamp_opt(61, 0).unwrap(), Utc);
     /// assert_eq!(Utc.timestamp_opt(61, 0).unwrap(), dt);
     /// ```
     </span><span class="comment">//
     // note: this constructor is purposely not named to `new` to discourage the direct usage.
     </span><span class="attribute">#[inline]
     #[must_use]
     </span><span class="kw">pub fn </span>from_utc(datetime: NaiveDateTime, offset: Tz::Offset) -&gt; DateTime&lt;Tz&gt; {
         DateTime { datetime, offset }
     }

     <span class="doccomment">/// Makes a new `DateTime` with given **local** datetime and offset that
     /// presents local timezone.
     ///
     /// # Example
     ///
     /// ```
     /// use chrono::DateTime;
     /// use chrono::naive::NaiveDate;
     /// use chrono::offset::{Utc, FixedOffset};
     ///
     /// let naivedatetime_utc = NaiveDate::from_ymd_opt(2000, 1, 12).unwrap().and_hms_opt(2, 0, 0).unwrap();
     /// let datetime_utc = DateTime::&lt;Utc&gt;::from_utc(naivedatetime_utc, Utc);
     ///
     /// let timezone_east = FixedOffset::east_opt(8 * 60 * 60).unwrap();
     /// let naivedatetime_east = NaiveDate::from_ymd_opt(2000, 1, 12).unwrap().and_hms_opt(10, 0, 0).unwrap();
     /// let datetime_east = DateTime::&lt;FixedOffset&gt;::from_local(naivedatetime_east, timezone_east);
     ///
     /// let timezone_west = FixedOffset::west_opt(7 * 60 * 60).unwrap();
     /// let naivedatetime_west = NaiveDate::from_ymd_opt(2000, 1, 11).unwrap().and_hms_opt(19, 0, 0).unwrap();
     /// let datetime_west = DateTime::&lt;FixedOffset&gt;::from_local(naivedatetime_west, timezone_west);

     /// assert_eq!(datetime_east, datetime_utc.with_timezone(&amp;timezone_east));
     /// assert_eq!(datetime_west, datetime_utc.with_timezone(&amp;timezone_west));
     /// ```
     </span><span class="attribute">#[inline]
     #[must_use]
     </span><span class="kw">pub fn </span>from_local(datetime: NaiveDateTime, offset: Tz::Offset) -&gt; DateTime&lt;Tz&gt; {
         <span class="kw">let </span>datetime_utc = datetime - offset.fix();

         DateTime { datetime: datetime_utc, offset }
     }

     <span class="doccomment">/// Retrieves a date component
     ///
     /// Unless you are immediately planning on turning this into a `DateTime`
     /// with the same Timezone you should use the
     /// [`date_naive`](DateTime::date_naive) method.
     </span><span class="attribute">#[inline]
     #[deprecated(since = <span class="string">&quot;0.4.23&quot;</span>, note = <span class="string">&quot;Use `date_naive()` instead&quot;</span>)]
     #[allow(deprecated)]
     #[must_use]
     </span><span class="kw">pub fn </span>date(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Date&lt;Tz&gt; {
         Date::from_utc(<span class="self">self</span>.naive_local().date(), <span class="self">self</span>.offset.clone())
     }

     <span class="doccomment">/// Retrieves the Date without an associated timezone
     ///
     /// [`NaiveDate`] is a more well-defined type, and has more traits implemented on it,
     /// so should be preferred to [`Date`] any time you truly want to operate on Dates.
     ///
     /// ```
     /// use chrono::prelude::*;
     ///
     /// let date: DateTime&lt;Utc&gt; = Utc.with_ymd_and_hms(2020, 1, 1, 0, 0, 0).unwrap();
     /// let other: DateTime&lt;FixedOffset&gt; = FixedOffset::east_opt(23).unwrap().with_ymd_and_hms(2020, 1, 1, 0, 0, 0).unwrap();
     /// assert_eq!(date.date_naive(), other.date_naive());
     /// ```
     </span><span class="attribute">#[inline]
     #[must_use]
     </span><span class="kw">pub fn </span>date_naive(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; NaiveDate {
         <span class="kw">let </span>local = <span class="self">self</span>.naive_local();
         NaiveDate::from_ymd_opt(local.year(), local.month(), local.day()).unwrap()
     }

     <span class="doccomment">/// Retrieves a time component.
     /// Unlike `date`, this is not associated to the time zone.
     </span><span class="attribute">#[inline]
     #[must_use]
     </span><span class="kw">pub fn </span>time(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; NaiveTime {
         <span class="self">self</span>.datetime.time() + <span class="self">self</span>.offset.fix()
     }

     <span class="doccomment">/// Returns the number of non-leap seconds since January 1, 1970 0:00:00 UTC
     /// (aka &quot;UNIX timestamp&quot;).
     </span><span class="attribute">#[inline]
     #[must_use]
     </span><span class="kw">pub fn </span>timestamp(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; i64 {
         <span class="self">self</span>.datetime.timestamp()
     }

     <span class="doccomment">/// Returns the number of non-leap-milliseconds since January 1, 1970 UTC
     ///
     /// Note that this does reduce the number of years that can be represented
     /// from ~584 Billion to ~584 Million. (If this is a problem, please file
     /// an issue to let me know what domain needs millisecond precision over
     /// billions of years, I&#39;m curious.)
     ///
     /// # Example
     ///
     /// ```
     /// use chrono::{Utc, NaiveDate};
     ///
     /// let dt = NaiveDate::from_ymd_opt(1970, 1, 1).unwrap().and_hms_milli_opt(0, 0, 1, 444).unwrap().and_local_timezone(Utc).unwrap();
     /// assert_eq!(dt.timestamp_millis(), 1_444);
     ///
     /// let dt = NaiveDate::from_ymd_opt(2001, 9, 9).unwrap().and_hms_milli_opt(1, 46, 40, 555).unwrap().and_local_timezone(Utc).unwrap();
     /// assert_eq!(dt.timestamp_millis(), 1_000_000_000_555);
     /// ```
     </span><span class="attribute">#[inline]
     #[must_use]
     </span><span class="kw">pub fn </span>timestamp_millis(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; i64 {
         <span class="self">self</span>.datetime.timestamp_millis()
     }

     <span class="doccomment">/// Returns the number of non-leap-microseconds since January 1, 1970 UTC
     ///
     /// Note that this does reduce the number of years that can be represented
     /// from ~584 Billion to ~584 Thousand. (If this is a problem, please file
     /// an issue to let me know what domain needs microsecond precision over
     /// millennia, I&#39;m curious.)
     ///
     /// # Example
     ///
     /// ```
     /// use chrono::{Utc, NaiveDate};
     ///
     /// let dt = NaiveDate::from_ymd_opt(1970, 1, 1).unwrap().and_hms_micro_opt(0, 0, 1, 444).unwrap().and_local_timezone(Utc).unwrap();
     /// assert_eq!(dt.timestamp_micros(), 1_000_444);
     ///
     /// let dt = NaiveDate::from_ymd_opt(2001, 9, 9).unwrap().and_hms_micro_opt(1, 46, 40, 555).unwrap().and_local_timezone(Utc).unwrap();
     /// assert_eq!(dt.timestamp_micros(), 1_000_000_000_000_555);
     /// ```
     </span><span class="attribute">#[inline]
     #[must_use]
     </span><span class="kw">pub fn </span>timestamp_micros(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; i64 {
         <span class="self">self</span>.datetime.timestamp_micros()
     }

     <span class="doccomment">/// Returns the number of non-leap-nanoseconds since January 1, 1970 UTC
     ///
     /// Note that this does reduce the number of years that can be represented
     /// from ~584 Billion to ~584. (If this is a problem, please file
     /// an issue to let me know what domain needs nanosecond precision over
     /// millennia, I&#39;m curious.)
     ///
     /// # Example
     ///
     /// ```
     /// use chrono::{Utc, NaiveDate};
     ///
     /// let dt = NaiveDate::from_ymd_opt(1970, 1, 1).unwrap().and_hms_nano_opt(0, 0, 1, 444).unwrap().and_local_timezone(Utc).unwrap();
     /// assert_eq!(dt.timestamp_nanos(), 1_000_000_444);
     ///
     /// let dt = NaiveDate::from_ymd_opt(2001, 9, 9).unwrap().and_hms_nano_opt(1, 46, 40, 555).unwrap().and_local_timezone(Utc).unwrap();
     /// assert_eq!(dt.timestamp_nanos(), 1_000_000_000_000_000_555);
     /// ```
     </span><span class="attribute">#[inline]
     #[must_use]
     </span><span class="kw">pub fn </span>timestamp_nanos(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; i64 {
         <span class="self">self</span>.datetime.timestamp_nanos()
     }

     <span class="doccomment">/// Returns the number of milliseconds since the last second boundary
     ///
     /// warning: in event of a leap second, this may exceed 999
     ///
     /// note: this is not the number of milliseconds since January 1, 1970 0:00:00 UTC
     </span><span class="attribute">#[inline]
     #[must_use]
     </span><span class="kw">pub fn </span>timestamp_subsec_millis(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; u32 {
         <span class="self">self</span>.datetime.timestamp_subsec_millis()
     }

     <span class="doccomment">/// Returns the number of microseconds since the last second boundary
     ///
     /// warning: in event of a leap second, this may exceed 999_999
     ///
     /// note: this is not the number of microseconds since January 1, 1970 0:00:00 UTC
     </span><span class="attribute">#[inline]
     #[must_use]
     </span><span class="kw">pub fn </span>timestamp_subsec_micros(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; u32 {
         <span class="self">self</span>.datetime.timestamp_subsec_micros()
     }

     <span class="doccomment">/// Returns the number of nanoseconds since the last second boundary
     ///
     /// warning: in event of a leap second, this may exceed 999_999_999
     ///
     /// note: this is not the number of nanoseconds since January 1, 1970 0:00:00 UTC
     </span><span class="attribute">#[inline]
     #[must_use]
     </span><span class="kw">pub fn </span>timestamp_subsec_nanos(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; u32 {
         <span class="self">self</span>.datetime.timestamp_subsec_nanos()
     }

     <span class="doccomment">/// Retrieves an associated offset from UTC.
     </span><span class="attribute">#[inline]
     #[must_use]
     </span><span class="kw">pub fn </span>offset(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>Tz::Offset {
         <span class="kw-2">&amp;</span><span class="self">self</span>.offset
     }

     <span class="doccomment">/// Retrieves an associated time zone.
     </span><span class="attribute">#[inline]
     #[must_use]
     </span><span class="kw">pub fn </span>timezone(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Tz {
         TimeZone::from_offset(<span class="kw-2">&amp;</span><span class="self">self</span>.offset)
     }

     <span class="doccomment">/// Changes the associated time zone.
     /// The returned `DateTime` references the same instant of time from the perspective of the provided time zone.
     </span><span class="attribute">#[inline]
     #[must_use]
     </span><span class="kw">pub fn </span>with_timezone&lt;Tz2: TimeZone&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, tz: <span class="kw-2">&amp;</span>Tz2) -&gt; DateTime&lt;Tz2&gt; {
         tz.from_utc_datetime(<span class="kw-2">&amp;</span><span class="self">self</span>.datetime)
     }

     <span class="doccomment">/// Fix the offset from UTC to its current value, dropping the associated timezone information.
     /// This it useful for converting a generic `DateTime&lt;Tz: Timezone&gt;` to `DateTime&lt;FixedOffset&gt;`.
     </span><span class="attribute">#[inline]
     #[must_use]
     </span><span class="kw">pub fn </span>fixed_offset(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; DateTime&lt;FixedOffset&gt; {
         <span class="self">self</span>.with_timezone(<span class="kw-2">&amp;</span><span class="self">self</span>.offset().fix())
     }

     <span class="doccomment">/// Adds given `Duration` to the current date and time.
     ///
     /// Returns `None` when it will result in overflow.
     </span><span class="attribute">#[inline]
     #[must_use]
     </span><span class="kw">pub fn </span>checked_add_signed(<span class="self">self</span>, rhs: OldDuration) -&gt; <span class="prelude-ty">Option</span>&lt;DateTime&lt;Tz&gt;&gt; {
         <span class="kw">let </span>datetime = <span class="self">self</span>.datetime.checked_add_signed(rhs)<span class="question-mark">?</span>;
         <span class="kw">let </span>tz = <span class="self">self</span>.timezone();
         <span class="prelude-val">Some</span>(tz.from_utc_datetime(<span class="kw-2">&amp;</span>datetime))
     }

     <span class="doccomment">/// Adds given `Months` to the current date and time.
     ///
     /// Returns `None` when it will result in overflow, or if the
     /// local time is not valid on the newly calculated date.
     ///
     /// See [`NaiveDate::checked_add_months`] for more details on behavior
     </span><span class="attribute">#[must_use]
     </span><span class="kw">pub fn </span>checked_add_months(<span class="self">self</span>, rhs: Months) -&gt; <span class="prelude-ty">Option</span>&lt;DateTime&lt;Tz&gt;&gt; {
         <span class="self">self</span>.naive_local()
             .checked_add_months(rhs)<span class="question-mark">?
             </span>.and_local_timezone(Tz::from_offset(<span class="kw-2">&amp;</span><span class="self">self</span>.offset))
             .single()
     }

     <span class="doccomment">/// Subtracts given `Duration` from the current date and time.
     ///
     /// Returns `None` when it will result in overflow.
     </span><span class="attribute">#[inline]
     #[must_use]
     </span><span class="kw">pub fn </span>checked_sub_signed(<span class="self">self</span>, rhs: OldDuration) -&gt; <span class="prelude-ty">Option</span>&lt;DateTime&lt;Tz&gt;&gt; {
         <span class="kw">let </span>datetime = <span class="self">self</span>.datetime.checked_sub_signed(rhs)<span class="question-mark">?</span>;
         <span class="kw">let </span>tz = <span class="self">self</span>.timezone();
         <span class="prelude-val">Some</span>(tz.from_utc_datetime(<span class="kw-2">&amp;</span>datetime))
     }

     <span class="doccomment">/// Subtracts given `Months` from the current date and time.
     ///
     /// Returns `None` when it will result in overflow, or if the
     /// local time is not valid on the newly calculated date.
     ///
     /// See [`NaiveDate::checked_sub_months`] for more details on behavior
     </span><span class="attribute">#[must_use]
     </span><span class="kw">pub fn </span>checked_sub_months(<span class="self">self</span>, rhs: Months) -&gt; <span class="prelude-ty">Option</span>&lt;DateTime&lt;Tz&gt;&gt; {
         <span class="self">self</span>.naive_local()
             .checked_sub_months(rhs)<span class="question-mark">?
             </span>.and_local_timezone(Tz::from_offset(<span class="kw-2">&amp;</span><span class="self">self</span>.offset))
             .single()
     }

     <span class="doccomment">/// Add a duration in [`Days`] to the date part of the `DateTime`
     ///
     /// Returns `None` if the resulting date would be out of range.
     </span><span class="attribute">#[must_use]
     </span><span class="kw">pub fn </span>checked_add_days(<span class="self">self</span>, days: Days) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="self">Self</span>&gt; {
         <span class="self">self</span>.naive_local()
             .checked_add_days(days)<span class="question-mark">?
             </span>.and_local_timezone(TimeZone::from_offset(<span class="kw-2">&amp;</span><span class="self">self</span>.offset))
             .single()
     }

     <span class="doccomment">/// Subtract a duration in [`Days`] from the date part of the `DateTime`
     ///
     /// Returns `None` if the resulting date would be out of range.
     </span><span class="attribute">#[must_use]
     </span><span class="kw">pub fn </span>checked_sub_days(<span class="self">self</span>, days: Days) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="self">Self</span>&gt; {
         <span class="self">self</span>.naive_local()
             .checked_sub_days(days)<span class="question-mark">?
             </span>.and_local_timezone(TimeZone::from_offset(<span class="kw-2">&amp;</span><span class="self">self</span>.offset))
             .single()
     }

     <span class="doccomment">/// Subtracts another `DateTime` from the current date and time.
     /// This does not overflow or underflow at all.
     </span><span class="attribute">#[inline]
     #[must_use]
     </span><span class="kw">pub fn </span>signed_duration_since&lt;Tz2: TimeZone&gt;(<span class="self">self</span>, rhs: DateTime&lt;Tz2&gt;) -&gt; OldDuration {
         <span class="self">self</span>.datetime.signed_duration_since(rhs.datetime)
     }

     <span class="doccomment">/// Returns a view to the naive UTC datetime.
     </span><span class="attribute">#[inline]
     #[must_use]
     </span><span class="kw">pub fn </span>naive_utc(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; NaiveDateTime {
         <span class="self">self</span>.datetime
     }

     <span class="doccomment">/// Returns a view to the naive local datetime.
     </span><span class="attribute">#[inline]
     #[must_use]
     </span><span class="kw">pub fn </span>naive_local(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; NaiveDateTime {
         <span class="self">self</span>.datetime + <span class="self">self</span>.offset.fix()
     }

     <span class="doccomment">/// Retrieve the elapsed years from now to the given [`DateTime`].
     </span><span class="attribute">#[must_use]
     </span><span class="kw">pub fn </span>years_since(<span class="kw-2">&amp;</span><span class="self">self</span>, base: <span class="self">Self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;u32&gt; {
         <span class="kw">let </span><span class="kw-2">mut </span>years = <span class="self">self</span>.year() - base.year();
         <span class="kw">let </span>earlier_time =
             (<span class="self">self</span>.month(), <span class="self">self</span>.day(), <span class="self">self</span>.time()) &lt; (base.month(), base.day(), base.time());

         years -= <span class="kw">match </span>earlier_time {
             <span class="bool-val">true </span>=&gt; <span class="number">1</span>,
             <span class="bool-val">false </span>=&gt; <span class="number">0</span>,
         };

         <span class="kw">match </span>years &gt;= <span class="number">0 </span>{
             <span class="bool-val">true </span>=&gt; <span class="prelude-val">Some</span>(years <span class="kw">as </span>u32),
             <span class="bool-val">false </span>=&gt; <span class="prelude-val">None</span>,
         }
     }

     <span class="doccomment">/// The minimum possible `DateTime&lt;Utc&gt;`.
     </span><span class="kw">pub const </span>MIN_UTC: DateTime&lt;Utc&gt; = DateTime { datetime: NaiveDateTime::MIN, offset: Utc };
     <span class="doccomment">/// The maximum possible `DateTime&lt;Utc&gt;`.
     </span><span class="kw">pub const </span>MAX_UTC: DateTime&lt;Utc&gt; = DateTime { datetime: NaiveDateTime::MAX, offset: Utc };
 }

 <span class="kw">impl </span>Default <span class="kw">for </span>DateTime&lt;Utc&gt; {
     <span class="kw">fn </span>default() -&gt; <span class="self">Self </span>{
         Utc.from_utc_datetime(<span class="kw-2">&amp;</span>NaiveDateTime::default())
     }
 }

 <span class="attribute">#[cfg(feature = <span class="string">&quot;clock&quot;</span>)]
 #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;clock&quot;</span>)))]
 </span><span class="kw">impl </span>Default <span class="kw">for </span>DateTime&lt;Local&gt; {
     <span class="kw">fn </span>default() -&gt; <span class="self">Self </span>{
         Local.from_utc_datetime(<span class="kw-2">&amp;</span>NaiveDateTime::default())
     }
 }

 <span class="kw">impl </span>Default <span class="kw">for </span>DateTime&lt;FixedOffset&gt; {
     <span class="kw">fn </span>default() -&gt; <span class="self">Self </span>{
         FixedOffset::west_opt(<span class="number">0</span>).unwrap().from_utc_datetime(<span class="kw-2">&amp;</span>NaiveDateTime::default())
     }
 }

 <span class="doccomment">/// Convert a `DateTime&lt;Utc&gt;` instance into a `DateTime&lt;FixedOffset&gt;` instance.
 </span><span class="kw">impl </span>From&lt;DateTime&lt;Utc&gt;&gt; <span class="kw">for </span>DateTime&lt;FixedOffset&gt; {
     <span class="doccomment">/// Convert this `DateTime&lt;Utc&gt;` instance into a `DateTime&lt;FixedOffset&gt;` instance.
     ///
     /// Conversion is done via [`DateTime::with_timezone`]. Note that the converted value returned by
     /// this will be created with a fixed timezone offset of 0.
     </span><span class="kw">fn </span>from(src: DateTime&lt;Utc&gt;) -&gt; <span class="self">Self </span>{
         src.with_timezone(<span class="kw-2">&amp;</span>FixedOffset::east_opt(<span class="number">0</span>).unwrap())
     }
 }

 <span class="doccomment">/// Convert a `DateTime&lt;Utc&gt;` instance into a `DateTime&lt;Local&gt;` instance.
 </span><span class="attribute">#[cfg(feature = <span class="string">&quot;clock&quot;</span>)]
 #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;clock&quot;</span>)))]
 </span><span class="kw">impl </span>From&lt;DateTime&lt;Utc&gt;&gt; <span class="kw">for </span>DateTime&lt;Local&gt; {
     <span class="doccomment">/// Convert this `DateTime&lt;Utc&gt;` instance into a `DateTime&lt;Local&gt;` instance.
     ///
     /// Conversion is performed via [`DateTime::with_timezone`], accounting for the difference in timezones.
     </span><span class="kw">fn </span>from(src: DateTime&lt;Utc&gt;) -&gt; <span class="self">Self </span>{
         src.with_timezone(<span class="kw-2">&amp;</span>Local)
     }
 }

 <span class="doccomment">/// Convert a `DateTime&lt;FixedOffset&gt;` instance into a `DateTime&lt;Utc&gt;` instance.
 </span><span class="kw">impl </span>From&lt;DateTime&lt;FixedOffset&gt;&gt; <span class="kw">for </span>DateTime&lt;Utc&gt; {
     <span class="doccomment">/// Convert this `DateTime&lt;FixedOffset&gt;` instance into a `DateTime&lt;Utc&gt;` instance.
     ///
     /// Conversion is performed via [`DateTime::with_timezone`], accounting for the timezone
     /// difference.
     </span><span class="kw">fn </span>from(src: DateTime&lt;FixedOffset&gt;) -&gt; <span class="self">Self </span>{
         src.with_timezone(<span class="kw-2">&amp;</span>Utc)
     }
 }

 <span class="doccomment">/// Convert a `DateTime&lt;FixedOffset&gt;` instance into a `DateTime&lt;Local&gt;` instance.
 </span><span class="attribute">#[cfg(feature = <span class="string">&quot;clock&quot;</span>)]
 #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;clock&quot;</span>)))]
 </span><span class="kw">impl </span>From&lt;DateTime&lt;FixedOffset&gt;&gt; <span class="kw">for </span>DateTime&lt;Local&gt; {
     <span class="doccomment">/// Convert this `DateTime&lt;FixedOffset&gt;` instance into a `DateTime&lt;Local&gt;` instance.
     ///
     /// Conversion is performed via [`DateTime::with_timezone`]. Returns the equivalent value in local
     /// time.
     </span><span class="kw">fn </span>from(src: DateTime&lt;FixedOffset&gt;) -&gt; <span class="self">Self </span>{
         src.with_timezone(<span class="kw-2">&amp;</span>Local)
     }
 }

 <span class="doccomment">/// Convert a `DateTime&lt;Local&gt;` instance into a `DateTime&lt;Utc&gt;` instance.
 </span><span class="attribute">#[cfg(feature = <span class="string">&quot;clock&quot;</span>)]
 #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;clock&quot;</span>)))]
 </span><span class="kw">impl </span>From&lt;DateTime&lt;Local&gt;&gt; <span class="kw">for </span>DateTime&lt;Utc&gt; {
     <span class="doccomment">/// Convert this `DateTime&lt;Local&gt;` instance into a `DateTime&lt;Utc&gt;` instance.
     ///
     /// Conversion is performed via [`DateTime::with_timezone`], accounting for the difference in
     /// timezones.
     </span><span class="kw">fn </span>from(src: DateTime&lt;Local&gt;) -&gt; <span class="self">Self </span>{
         src.with_timezone(<span class="kw-2">&amp;</span>Utc)
     }
 }

 <span class="doccomment">/// Convert a `DateTime&lt;Local&gt;` instance into a `DateTime&lt;FixedOffset&gt;` instance.
 </span><span class="attribute">#[cfg(feature = <span class="string">&quot;clock&quot;</span>)]
 #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;clock&quot;</span>)))]
 </span><span class="kw">impl </span>From&lt;DateTime&lt;Local&gt;&gt; <span class="kw">for </span>DateTime&lt;FixedOffset&gt; {
     <span class="doccomment">/// Convert this `DateTime&lt;Local&gt;` instance into a `DateTime&lt;FixedOffset&gt;` instance.
     ///
     /// Conversion is performed via [`DateTime::with_timezone`].
     </span><span class="kw">fn </span>from(src: DateTime&lt;Local&gt;) -&gt; <span class="self">Self </span>{
         src.with_timezone(<span class="kw-2">&amp;</span>src.offset().fix())
     }
 }

 <span class="doccomment">/// Maps the local datetime to other datetime with given conversion function.
 </span><span class="kw">fn </span>map_local&lt;Tz: TimeZone, F&gt;(dt: <span class="kw-2">&amp;</span>DateTime&lt;Tz&gt;, <span class="kw-2">mut </span>f: F) -&gt; <span class="prelude-ty">Option</span>&lt;DateTime&lt;Tz&gt;&gt;
 <span class="kw">where
     </span>F: FnMut(NaiveDateTime) -&gt; <span class="prelude-ty">Option</span>&lt;NaiveDateTime&gt;,
 {
     f(dt.naive_local()).and_then(|datetime| dt.timezone().from_local_datetime(<span class="kw-2">&amp;</span>datetime).single())
 }

 <span class="kw">impl </span>DateTime&lt;FixedOffset&gt; {
     <span class="doccomment">/// Parses an RFC 2822 date-and-time string into a `DateTime&lt;FixedOffset&gt;` value.
     ///
     /// This parses valid RFC 2822 datetime strings (such as `Tue, 1 Jul 2003 10:52:37 +0200`)
     /// and returns a new [`DateTime`] instance with the parsed timezone as the [`FixedOffset`].
     ///
     /// RFC 2822 is the internet message standard that specifies the representation of times in HTTP
     /// and email headers.
     ///
     /// ```
     /// # use chrono::{DateTime, FixedOffset, TimeZone};
     /// assert_eq!(
     ///     DateTime::parse_from_rfc2822(&quot;Wed, 18 Feb 2015 23:16:09 GMT&quot;).unwrap(),
     ///     FixedOffset::east_opt(0).unwrap().with_ymd_and_hms(2015, 2, 18, 23, 16, 9).unwrap()
     /// );
     /// ```
     </span><span class="kw">pub fn </span>parse_from_rfc2822(s: <span class="kw-2">&amp;</span>str) -&gt; ParseResult&lt;DateTime&lt;FixedOffset&gt;&gt; {
         <span class="kw">const </span>ITEMS: <span class="kw-2">&amp;</span>[Item&lt;<span class="lifetime">&#39;static</span>&gt;] = <span class="kw-2">&amp;</span>[Item::Fixed(Fixed::RFC2822)];
         <span class="kw">let </span><span class="kw-2">mut </span>parsed = Parsed::new();
         parse(<span class="kw-2">&amp;mut </span>parsed, s, ITEMS.iter())<span class="question-mark">?</span>;
         parsed.to_datetime()
     }

     <span class="doccomment">/// Parses an RFC 3339 date-and-time string into a `DateTime&lt;FixedOffset&gt;` value.
     ///
     /// Parses all valid RFC 3339 values (as well as the subset of valid ISO 8601 values that are
     /// also valid RFC 3339 date-and-time values) and returns a new [`DateTime`] with a
     /// [`FixedOffset`] corresponding to the parsed timezone. While RFC 3339 values come in a wide
     /// variety of shapes and sizes, `1996-12-19T16:39:57-08:00` is an example of the most commonly
     /// encountered variety of RFC 3339 formats.
     ///
     /// Why isn&#39;t this named `parse_from_iso8601`? That&#39;s because ISO 8601 allows representing
     /// values in a wide range of formats, only some of which represent actual date-and-time
     /// instances (rather than periods, ranges, dates, or times). Some valid ISO 8601 values are
     /// also simultaneously valid RFC 3339 values, but not all RFC 3339 values are valid ISO 8601
     /// values (or the other way around).
     </span><span class="kw">pub fn </span>parse_from_rfc3339(s: <span class="kw-2">&amp;</span>str) -&gt; ParseResult&lt;DateTime&lt;FixedOffset&gt;&gt; {
         <span class="kw">const </span>ITEMS: <span class="kw-2">&amp;</span>[Item&lt;<span class="lifetime">&#39;static</span>&gt;] = <span class="kw-2">&amp;</span>[Item::Fixed(Fixed::RFC3339)];
         <span class="kw">let </span><span class="kw-2">mut </span>parsed = Parsed::new();
         parse(<span class="kw-2">&amp;mut </span>parsed, s, ITEMS.iter())<span class="question-mark">?</span>;
         parsed.to_datetime()
     }

     <span class="doccomment">/// Parses a string from a user-specified format into a `DateTime&lt;FixedOffset&gt;` value.
     ///
     /// Note that this method *requires a timezone* in the input string. See
     /// [`NaiveDateTime::parse_from_str`](./naive/struct.NaiveDateTime.html#method.parse_from_str)
     /// for a version that does not require a timezone in the to-be-parsed str. The returned
     /// [`DateTime`] value will have a [`FixedOffset`] reflecting the parsed timezone.
     ///
     /// See the [`format::strftime` module](./format/strftime/index.html) for supported format
     /// sequences.
     ///
     /// # Example
     ///
     /// ```rust
     /// use chrono::{DateTime, FixedOffset, TimeZone, NaiveDate};
     ///
     /// let dt = DateTime::parse_from_str(
     ///     &quot;1983 Apr 13 12:09:14.274 +0000&quot;, &quot;%Y %b %d %H:%M:%S%.3f %z&quot;);
     /// assert_eq!(dt, Ok(FixedOffset::east_opt(0).unwrap().from_local_datetime(&amp;NaiveDate::from_ymd_opt(1983, 4, 13).unwrap().and_hms_milli_opt(12, 9, 14, 274).unwrap()).unwrap()));
     /// ```
     </span><span class="kw">pub fn </span>parse_from_str(s: <span class="kw-2">&amp;</span>str, fmt: <span class="kw-2">&amp;</span>str) -&gt; ParseResult&lt;DateTime&lt;FixedOffset&gt;&gt; {
         <span class="kw">let </span><span class="kw-2">mut </span>parsed = Parsed::new();
         parse(<span class="kw-2">&amp;mut </span>parsed, s, StrftimeItems::new(fmt))<span class="question-mark">?</span>;
         parsed.to_datetime()
     }

     <span class="doccomment">/// Parses a string from a user-specified format into a `DateTime&lt;FixedOffset&gt;` value, and a
     /// slice with the remaining portion of the string.
     ///
     /// Note that this method *requires a timezone* in the input string. See
     /// [`NaiveDateTime::parse_and_remainder`] for a version that does not
     /// require a timezone in `s`. The returned [`DateTime`] value will have a [`FixedOffset`]
     /// reflecting the parsed timezone.
     ///
     /// See the [`format::strftime` module](./format/strftime/index.html) for supported format
     /// sequences.
     ///
     /// Similar to [`parse_from_str`](#method.parse_from_str).
     ///
     /// # Example
     ///
     /// ```rust
     /// # use chrono::{DateTime, FixedOffset, TimeZone};
     /// let (datetime, remainder) = DateTime::parse_and_remainder(
     ///     &quot;2015-02-18 23:16:09 +0200 trailing text&quot;, &quot;%Y-%m-%d %H:%M:%S %z&quot;).unwrap();
     /// assert_eq!(
     ///     datetime,
     ///     FixedOffset::east_opt(2*3600).unwrap().with_ymd_and_hms(2015, 2, 18, 23, 16, 9).unwrap()
     /// );
     /// assert_eq!(remainder, &quot; trailing text&quot;);
     /// ```
     </span><span class="kw">pub fn </span>parse_and_remainder&lt;<span class="lifetime">&#39;a</span>&gt;(
         s: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str,
         fmt: <span class="kw-2">&amp;</span>str,
     ) -&gt; ParseResult&lt;(DateTime&lt;FixedOffset&gt;, <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str)&gt; {
         <span class="kw">let </span><span class="kw-2">mut </span>parsed = Parsed::new();
         <span class="kw">let </span>remainder = parse_and_remainder(<span class="kw-2">&amp;mut </span>parsed, s, StrftimeItems::new(fmt))<span class="question-mark">?</span>;
         parsed.to_datetime().map(|d| (d, remainder))
     }
 }

 <span class="kw">impl</span>&lt;Tz: TimeZone&gt; DateTime&lt;Tz&gt;
 <span class="kw">where
     </span>Tz::Offset: fmt::Display,
 {
     <span class="doccomment">/// Returns an RFC 2822 date and time string such as `Tue, 1 Jul 2003 10:52:37 +0200`.
     </span><span class="attribute">#[cfg(any(feature = <span class="string">&quot;alloc&quot;</span>, feature = <span class="string">&quot;std&quot;</span>, test))]
     #[cfg_attr(docsrs, doc(cfg(any(feature = <span class="string">&quot;alloc&quot;</span>, feature = <span class="string">&quot;std&quot;</span>))))]
     #[must_use]
     </span><span class="kw">pub fn </span>to_rfc2822(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; String {
         <span class="kw">let </span><span class="kw-2">mut </span>result = String::with_capacity(<span class="number">32</span>);
         <span class="kw">crate</span>::format::write_rfc2822(<span class="kw-2">&amp;mut </span>result, <span class="self">self</span>.naive_local(), <span class="self">self</span>.offset.fix())
             .expect(<span class="string">&quot;writing rfc2822 datetime to string should never fail&quot;</span>);
         result
     }

     <span class="doccomment">/// Returns an RFC 3339 and ISO 8601 date and time string such as `1996-12-19T16:39:57-08:00`.
     </span><span class="attribute">#[cfg(any(feature = <span class="string">&quot;alloc&quot;</span>, feature = <span class="string">&quot;std&quot;</span>, test))]
     #[cfg_attr(docsrs, doc(cfg(any(feature = <span class="string">&quot;alloc&quot;</span>, feature = <span class="string">&quot;std&quot;</span>))))]
     #[must_use]
     </span><span class="kw">pub fn </span>to_rfc3339(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; String {
         <span class="kw">let </span><span class="kw-2">mut </span>result = String::with_capacity(<span class="number">32</span>);
         <span class="kw">crate</span>::format::write_rfc3339(<span class="kw-2">&amp;mut </span>result, <span class="self">self</span>.naive_local(), <span class="self">self</span>.offset.fix())
             .expect(<span class="string">&quot;writing rfc3339 datetime to string should never fail&quot;</span>);
         result
     }

     <span class="doccomment">/// Return an RFC 3339 and ISO 8601 date and time string with subseconds
     /// formatted as per `SecondsFormat`.
     ///
     /// If `use_z` is true and the timezone is UTC (offset 0), uses `Z` as
     /// per [`Fixed::TimezoneOffsetColonZ`]. If `use_z` is false, uses
     /// [`Fixed::TimezoneOffsetColon`]
     ///
     /// # Examples
     ///
     /// ```rust
     /// # use chrono::{FixedOffset, SecondsFormat, TimeZone, Utc, NaiveDate};
     /// let dt = NaiveDate::from_ymd_opt(2018, 1, 26).unwrap().and_hms_micro_opt(18, 30, 9, 453_829).unwrap().and_local_timezone(Utc).unwrap();
     /// assert_eq!(dt.to_rfc3339_opts(SecondsFormat::Millis, false),
     ///            &quot;2018-01-26T18:30:09.453+00:00&quot;);
     /// assert_eq!(dt.to_rfc3339_opts(SecondsFormat::Millis, true),
     ///            &quot;2018-01-26T18:30:09.453Z&quot;);
     /// assert_eq!(dt.to_rfc3339_opts(SecondsFormat::Secs, true),
     ///            &quot;2018-01-26T18:30:09Z&quot;);
     ///
     /// let pst = FixedOffset::east_opt(8 * 60 * 60).unwrap();
     /// let dt = pst.from_local_datetime(&amp;NaiveDate::from_ymd_opt(2018, 1, 26).unwrap().and_hms_micro_opt(10, 30, 9, 453_829).unwrap()).unwrap();
     /// assert_eq!(dt.to_rfc3339_opts(SecondsFormat::Secs, true),
     ///            &quot;2018-01-26T10:30:09+08:00&quot;);
     /// ```
     </span><span class="attribute">#[cfg(any(feature = <span class="string">&quot;alloc&quot;</span>, feature = <span class="string">&quot;std&quot;</span>, test))]
     #[cfg_attr(docsrs, doc(cfg(any(feature = <span class="string">&quot;alloc&quot;</span>, feature = <span class="string">&quot;std&quot;</span>))))]
     #[must_use]
     </span><span class="kw">pub fn </span>to_rfc3339_opts(<span class="kw-2">&amp;</span><span class="self">self</span>, secform: SecondsFormat, use_z: bool) -&gt; String {
         <span class="kw">use </span><span class="kw">crate</span>::format::Numeric::<span class="kw-2">*</span>;
         <span class="kw">use </span><span class="kw">crate</span>::format::Pad::Zero;
         <span class="kw">use </span><span class="kw">crate</span>::SecondsFormat::<span class="kw-2">*</span>;

         <span class="macro">debug_assert!</span>(secform != __NonExhaustive, <span class="string">&quot;Do not use __NonExhaustive!&quot;</span>);

         <span class="kw">const </span>PREFIX: <span class="kw-2">&amp;</span>[Item&lt;<span class="lifetime">&#39;static</span>&gt;] = <span class="kw-2">&amp;</span>[
             Item::Numeric(Year, Zero),
             Item::Literal(<span class="string">&quot;-&quot;</span>),
             Item::Numeric(Month, Zero),
             Item::Literal(<span class="string">&quot;-&quot;</span>),
             Item::Numeric(Day, Zero),
             Item::Literal(<span class="string">&quot;T&quot;</span>),
             Item::Numeric(Hour, Zero),
             Item::Literal(<span class="string">&quot;:&quot;</span>),
             Item::Numeric(Minute, Zero),
             Item::Literal(<span class="string">&quot;:&quot;</span>),
             Item::Numeric(Second, Zero),
         ];

         <span class="kw">let </span>ssitem = <span class="kw">match </span>secform {
             Secs =&gt; <span class="prelude-val">None</span>,
             Millis =&gt; <span class="prelude-val">Some</span>(Item::Fixed(Fixed::Nanosecond3)),
             Micros =&gt; <span class="prelude-val">Some</span>(Item::Fixed(Fixed::Nanosecond6)),
             Nanos =&gt; <span class="prelude-val">Some</span>(Item::Fixed(Fixed::Nanosecond9)),
             AutoSi =&gt; <span class="prelude-val">Some</span>(Item::Fixed(Fixed::Nanosecond)),
             __NonExhaustive =&gt; <span class="macro">unreachable!</span>(),
         };

         <span class="kw">let </span>tzitem = Item::Fixed(<span class="kw">if </span>use_z {
             Fixed::TimezoneOffsetColonZ
         } <span class="kw">else </span>{
             Fixed::TimezoneOffsetColon
         });

         <span class="kw">match </span>ssitem {
             <span class="prelude-val">None </span>=&gt; <span class="self">self</span>.format_with_items(PREFIX.iter().chain([tzitem].iter())).to_string(),
             <span class="prelude-val">Some</span>(s) =&gt; <span class="self">self</span>.format_with_items(PREFIX.iter().chain([s, tzitem].iter())).to_string(),
         }
     }

     <span class="doccomment">/// Formats the combined date and time with the specified formatting items.
     </span><span class="attribute">#[cfg(any(feature = <span class="string">&quot;alloc&quot;</span>, feature = <span class="string">&quot;std&quot;</span>, test))]
     #[cfg_attr(docsrs, doc(cfg(any(feature = <span class="string">&quot;alloc&quot;</span>, feature = <span class="string">&quot;std&quot;</span>))))]
     #[inline]
     #[must_use]
     </span><span class="kw">pub fn </span>format_with_items&lt;<span class="lifetime">&#39;a</span>, I, B&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, items: I) -&gt; DelayedFormat&lt;I&gt;
     <span class="kw">where
         </span>I: Iterator&lt;Item = B&gt; + Clone,
         B: Borrow&lt;Item&lt;<span class="lifetime">&#39;a</span>&gt;&gt;,
     {
         <span class="kw">let </span>local = <span class="self">self</span>.naive_local();
         DelayedFormat::new_with_offset(<span class="prelude-val">Some</span>(local.date()), <span class="prelude-val">Some</span>(local.time()), <span class="kw-2">&amp;</span><span class="self">self</span>.offset, items)
     }

     <span class="doccomment">/// Formats the combined date and time per the specified format string.
     ///
     /// See the [`crate::format::strftime`] module for the supported escape sequences.
     ///
     /// # Example
     /// ```rust
     /// use chrono::prelude::*;
     ///
     /// let date_time: DateTime&lt;Utc&gt; = Utc.with_ymd_and_hms(2017, 04, 02, 12, 50, 32).unwrap();
     /// let formatted = format!(&quot;{}&quot;, date_time.format(&quot;%d/%m/%Y %H:%M&quot;));
     /// assert_eq!(formatted, &quot;02/04/2017 12:50&quot;);
     /// ```
     </span><span class="attribute">#[cfg(any(feature = <span class="string">&quot;alloc&quot;</span>, feature = <span class="string">&quot;std&quot;</span>, test))]
     #[cfg_attr(docsrs, doc(cfg(any(feature = <span class="string">&quot;alloc&quot;</span>, feature = <span class="string">&quot;std&quot;</span>))))]
     #[inline]
     #[must_use]
     </span><span class="kw">pub fn </span>format&lt;<span class="lifetime">&#39;a</span>&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, fmt: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str) -&gt; DelayedFormat&lt;StrftimeItems&lt;<span class="lifetime">&#39;a</span>&gt;&gt; {
         <span class="self">self</span>.format_with_items(StrftimeItems::new(fmt))
     }

     <span class="doccomment">/// Formats the combined date and time with the specified formatting items and locale.
     </span><span class="attribute">#[cfg(feature = <span class="string">&quot;unstable-locales&quot;</span>)]
     #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;unstable-locales&quot;</span>)))]
     #[inline]
     #[must_use]
     </span><span class="kw">pub fn </span>format_localized_with_items&lt;<span class="lifetime">&#39;a</span>, I, B&gt;(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         items: I,
         locale: Locale,
     ) -&gt; DelayedFormat&lt;I&gt;
     <span class="kw">where
         </span>I: Iterator&lt;Item = B&gt; + Clone,
         B: Borrow&lt;Item&lt;<span class="lifetime">&#39;a</span>&gt;&gt;,
     {
         <span class="kw">let </span>local = <span class="self">self</span>.naive_local();
         DelayedFormat::new_with_offset_and_locale(
             <span class="prelude-val">Some</span>(local.date()),
             <span class="prelude-val">Some</span>(local.time()),
             <span class="kw-2">&amp;</span><span class="self">self</span>.offset,
             items,
             locale,
         )
     }

     <span class="doccomment">/// Formats the combined date and time per the specified format string and
     /// locale.
     ///
     /// See the [`crate::format::strftime`] module on the supported escape
     /// sequences.
     </span><span class="attribute">#[cfg(feature = <span class="string">&quot;unstable-locales&quot;</span>)]
     #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;unstable-locales&quot;</span>)))]
     #[inline]
     #[must_use]
     </span><span class="kw">pub fn </span>format_localized&lt;<span class="lifetime">&#39;a</span>&gt;(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         fmt: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str,
         locale: Locale,
     ) -&gt; DelayedFormat&lt;StrftimeItems&lt;<span class="lifetime">&#39;a</span>&gt;&gt; {
         <span class="self">self</span>.format_localized_with_items(StrftimeItems::new_with_locale(fmt, locale), locale)
     }
 }

 <span class="kw">impl</span>&lt;Tz: TimeZone&gt; Datelike <span class="kw">for </span>DateTime&lt;Tz&gt; {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>year(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; i32 {
         <span class="self">self</span>.naive_local().year()
     }
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>month(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; u32 {
         <span class="self">self</span>.naive_local().month()
     }
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>month0(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; u32 {
         <span class="self">self</span>.naive_local().month0()
     }
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>day(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; u32 {
         <span class="self">self</span>.naive_local().day()
     }
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>day0(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; u32 {
         <span class="self">self</span>.naive_local().day0()
     }
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>ordinal(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; u32 {
         <span class="self">self</span>.naive_local().ordinal()
     }
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>ordinal0(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; u32 {
         <span class="self">self</span>.naive_local().ordinal0()
     }
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>weekday(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Weekday {
         <span class="self">self</span>.naive_local().weekday()
     }
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>iso_week(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; IsoWeek {
         <span class="self">self</span>.naive_local().iso_week()
     }

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>with_year(<span class="kw-2">&amp;</span><span class="self">self</span>, year: i32) -&gt; <span class="prelude-ty">Option</span>&lt;DateTime&lt;Tz&gt;&gt; {
         map_local(<span class="self">self</span>, |datetime| datetime.with_year(year))
     }

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>with_month(<span class="kw-2">&amp;</span><span class="self">self</span>, month: u32) -&gt; <span class="prelude-ty">Option</span>&lt;DateTime&lt;Tz&gt;&gt; {
         map_local(<span class="self">self</span>, |datetime| datetime.with_month(month))
     }

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>with_month0(<span class="kw-2">&amp;</span><span class="self">self</span>, month0: u32) -&gt; <span class="prelude-ty">Option</span>&lt;DateTime&lt;Tz&gt;&gt; {
         map_local(<span class="self">self</span>, |datetime| datetime.with_month0(month0))
     }

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>with_day(<span class="kw-2">&amp;</span><span class="self">self</span>, day: u32) -&gt; <span class="prelude-ty">Option</span>&lt;DateTime&lt;Tz&gt;&gt; {
         map_local(<span class="self">self</span>, |datetime| datetime.with_day(day))
     }

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>with_day0(<span class="kw-2">&amp;</span><span class="self">self</span>, day0: u32) -&gt; <span class="prelude-ty">Option</span>&lt;DateTime&lt;Tz&gt;&gt; {
         map_local(<span class="self">self</span>, |datetime| datetime.with_day0(day0))
     }

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>with_ordinal(<span class="kw-2">&amp;</span><span class="self">self</span>, ordinal: u32) -&gt; <span class="prelude-ty">Option</span>&lt;DateTime&lt;Tz&gt;&gt; {
         map_local(<span class="self">self</span>, |datetime| datetime.with_ordinal(ordinal))
     }

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>with_ordinal0(<span class="kw-2">&amp;</span><span class="self">self</span>, ordinal0: u32) -&gt; <span class="prelude-ty">Option</span>&lt;DateTime&lt;Tz&gt;&gt; {
         map_local(<span class="self">self</span>, |datetime| datetime.with_ordinal0(ordinal0))
     }
 }

 <span class="kw">impl</span>&lt;Tz: TimeZone&gt; Timelike <span class="kw">for </span>DateTime&lt;Tz&gt; {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>hour(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; u32 {
         <span class="self">self</span>.naive_local().hour()
     }
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>minute(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; u32 {
         <span class="self">self</span>.naive_local().minute()
     }
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>second(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; u32 {
         <span class="self">self</span>.naive_local().second()
     }
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>nanosecond(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; u32 {
         <span class="self">self</span>.naive_local().nanosecond()
     }

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>with_hour(<span class="kw-2">&amp;</span><span class="self">self</span>, hour: u32) -&gt; <span class="prelude-ty">Option</span>&lt;DateTime&lt;Tz&gt;&gt; {
         map_local(<span class="self">self</span>, |datetime| datetime.with_hour(hour))
     }

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>with_minute(<span class="kw-2">&amp;</span><span class="self">self</span>, min: u32) -&gt; <span class="prelude-ty">Option</span>&lt;DateTime&lt;Tz&gt;&gt; {
         map_local(<span class="self">self</span>, |datetime| datetime.with_minute(min))
     }

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>with_second(<span class="kw-2">&amp;</span><span class="self">self</span>, sec: u32) -&gt; <span class="prelude-ty">Option</span>&lt;DateTime&lt;Tz&gt;&gt; {
         map_local(<span class="self">self</span>, |datetime| datetime.with_second(sec))
     }

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>with_nanosecond(<span class="kw-2">&amp;</span><span class="self">self</span>, nano: u32) -&gt; <span class="prelude-ty">Option</span>&lt;DateTime&lt;Tz&gt;&gt; {
         map_local(<span class="self">self</span>, |datetime| datetime.with_nanosecond(nano))
     }
 }

 <span class="comment">// we need them as automatic impls cannot handle associated types
 </span><span class="kw">impl</span>&lt;Tz: TimeZone&gt; Copy <span class="kw">for </span>DateTime&lt;Tz&gt; <span class="kw">where </span>&lt;Tz <span class="kw">as </span>TimeZone&gt;::Offset: Copy {}
 <span class="kw">unsafe impl</span>&lt;Tz: TimeZone&gt; Send <span class="kw">for </span>DateTime&lt;Tz&gt; <span class="kw">where </span>&lt;Tz <span class="kw">as </span>TimeZone&gt;::Offset: Send {}

 <span class="kw">impl</span>&lt;Tz: TimeZone, Tz2: TimeZone&gt; PartialEq&lt;DateTime&lt;Tz2&gt;&gt; <span class="kw">for </span>DateTime&lt;Tz&gt; {
     <span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>DateTime&lt;Tz2&gt;) -&gt; bool {
         <span class="self">self</span>.datetime == other.datetime
     }
 }

 <span class="kw">impl</span>&lt;Tz: TimeZone&gt; Eq <span class="kw">for </span>DateTime&lt;Tz&gt; {}

 <span class="kw">impl</span>&lt;Tz: TimeZone, Tz2: TimeZone&gt; PartialOrd&lt;DateTime&lt;Tz2&gt;&gt; <span class="kw">for </span>DateTime&lt;Tz&gt; {
     <span class="doccomment">/// Compare two DateTimes based on their true time, ignoring time zones
     ///
     /// # Example
     ///
     /// ```
     /// use chrono::prelude::*;
     ///
     /// let earlier = Utc.with_ymd_and_hms(2015, 5, 15, 2, 0, 0).unwrap().with_timezone(&amp;FixedOffset::west_opt(1 * 3600).unwrap());
     /// let later   = Utc.with_ymd_and_hms(2015, 5, 15, 3, 0, 0).unwrap().with_timezone(&amp;FixedOffset::west_opt(5 * 3600).unwrap());
     ///
     /// assert_eq!(earlier.to_string(), &quot;2015-05-15 01:00:00 -01:00&quot;);
     /// assert_eq!(later.to_string(), &quot;2015-05-14 22:00:00 -05:00&quot;);
     ///
     /// assert!(later &gt; earlier);
     /// ```
     </span><span class="kw">fn </span>partial_cmp(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>DateTime&lt;Tz2&gt;) -&gt; <span class="prelude-ty">Option</span>&lt;Ordering&gt; {
         <span class="self">self</span>.datetime.partial_cmp(<span class="kw-2">&amp;</span>other.datetime)
     }
 }

 <span class="kw">impl</span>&lt;Tz: TimeZone&gt; Ord <span class="kw">for </span>DateTime&lt;Tz&gt; {
     <span class="kw">fn </span>cmp(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>DateTime&lt;Tz&gt;) -&gt; Ordering {
         <span class="self">self</span>.datetime.cmp(<span class="kw-2">&amp;</span>other.datetime)
     }
 }

 <span class="kw">impl</span>&lt;Tz: TimeZone&gt; hash::Hash <span class="kw">for </span>DateTime&lt;Tz&gt; {
     <span class="kw">fn </span>hash&lt;H: hash::Hasher&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, state: <span class="kw-2">&amp;mut </span>H) {
         <span class="self">self</span>.datetime.hash(state)
     }
 }

 <span class="kw">impl</span>&lt;Tz: TimeZone&gt; Add&lt;OldDuration&gt; <span class="kw">for </span>DateTime&lt;Tz&gt; {
     <span class="kw">type </span>Output = DateTime&lt;Tz&gt;;

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>add(<span class="self">self</span>, rhs: OldDuration) -&gt; DateTime&lt;Tz&gt; {
         <span class="self">self</span>.checked_add_signed(rhs).expect(<span class="string">&quot;`DateTime + Duration` overflowed&quot;</span>)
     }
 }

 <span class="kw">impl</span>&lt;Tz: TimeZone&gt; AddAssign&lt;OldDuration&gt; <span class="kw">for </span>DateTime&lt;Tz&gt; {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>add_assign(<span class="kw-2">&amp;mut </span><span class="self">self</span>, rhs: OldDuration) {
         <span class="kw">let </span>datetime =
             <span class="self">self</span>.datetime.checked_add_signed(rhs).expect(<span class="string">&quot;`DateTime + Duration` overflowed&quot;</span>);
         <span class="kw">let </span>tz = <span class="self">self</span>.timezone();
         <span class="kw-2">*</span><span class="self">self </span>= tz.from_utc_datetime(<span class="kw-2">&amp;</span>datetime);
     }
 }

 <span class="kw">impl</span>&lt;Tz: TimeZone&gt; Add&lt;Months&gt; <span class="kw">for </span>DateTime&lt;Tz&gt; {
     <span class="kw">type </span>Output = DateTime&lt;Tz&gt;;

     <span class="kw">fn </span>add(<span class="self">self</span>, rhs: Months) -&gt; <span class="self">Self</span>::Output {
         <span class="self">self</span>.checked_add_months(rhs).unwrap()
     }
 }

 <span class="kw">impl</span>&lt;Tz: TimeZone&gt; Sub&lt;OldDuration&gt; <span class="kw">for </span>DateTime&lt;Tz&gt; {
     <span class="kw">type </span>Output = DateTime&lt;Tz&gt;;

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>sub(<span class="self">self</span>, rhs: OldDuration) -&gt; DateTime&lt;Tz&gt; {
         <span class="self">self</span>.checked_sub_signed(rhs).expect(<span class="string">&quot;`DateTime - Duration` overflowed&quot;</span>)
     }
 }

 <span class="kw">impl</span>&lt;Tz: TimeZone&gt; SubAssign&lt;OldDuration&gt; <span class="kw">for </span>DateTime&lt;Tz&gt; {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>sub_assign(<span class="kw-2">&amp;mut </span><span class="self">self</span>, rhs: OldDuration) {
         <span class="kw">let </span>datetime =
             <span class="self">self</span>.datetime.checked_sub_signed(rhs).expect(<span class="string">&quot;`DateTime - Duration` overflowed&quot;</span>);
         <span class="kw">let </span>tz = <span class="self">self</span>.timezone();
         <span class="kw-2">*</span><span class="self">self </span>= tz.from_utc_datetime(<span class="kw-2">&amp;</span>datetime)
     }
 }

 <span class="kw">impl</span>&lt;Tz: TimeZone&gt; Sub&lt;Months&gt; <span class="kw">for </span>DateTime&lt;Tz&gt; {
     <span class="kw">type </span>Output = DateTime&lt;Tz&gt;;

     <span class="kw">fn </span>sub(<span class="self">self</span>, rhs: Months) -&gt; <span class="self">Self</span>::Output {
         <span class="self">self</span>.checked_sub_months(rhs).unwrap()
     }
 }

 <span class="kw">impl</span>&lt;Tz: TimeZone&gt; Sub&lt;DateTime&lt;Tz&gt;&gt; <span class="kw">for </span>DateTime&lt;Tz&gt; {
     <span class="kw">type </span>Output = OldDuration;

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>sub(<span class="self">self</span>, rhs: DateTime&lt;Tz&gt;) -&gt; OldDuration {
         <span class="self">self</span>.signed_duration_since(rhs)
     }
 }

 <span class="kw">impl</span>&lt;Tz: TimeZone&gt; Add&lt;Days&gt; <span class="kw">for </span>DateTime&lt;Tz&gt; {
     <span class="kw">type </span>Output = DateTime&lt;Tz&gt;;

     <span class="kw">fn </span>add(<span class="self">self</span>, days: Days) -&gt; <span class="self">Self</span>::Output {
         <span class="self">self</span>.checked_add_days(days).unwrap()
     }
 }

 <span class="kw">impl</span>&lt;Tz: TimeZone&gt; Sub&lt;Days&gt; <span class="kw">for </span>DateTime&lt;Tz&gt; {
     <span class="kw">type </span>Output = DateTime&lt;Tz&gt;;

     <span class="kw">fn </span>sub(<span class="self">self</span>, days: Days) -&gt; <span class="self">Self</span>::Output {
         <span class="self">self</span>.checked_sub_days(days).unwrap()
     }
 }

 <span class="kw">impl</span>&lt;Tz: TimeZone&gt; fmt::Debug <span class="kw">for </span>DateTime&lt;Tz&gt; {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         <span class="self">self</span>.naive_local().fmt(f)<span class="question-mark">?</span>;
         <span class="self">self</span>.offset.fmt(f)
     }
 }

 <span class="kw">impl</span>&lt;Tz: TimeZone&gt; fmt::Display <span class="kw">for </span>DateTime&lt;Tz&gt;
 <span class="kw">where
     </span>Tz::Offset: fmt::Display,
 {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         <span class="self">self</span>.naive_local().fmt(f)<span class="question-mark">?</span>;
         f.write_char(<span class="string">&#39; &#39;</span>)<span class="question-mark">?</span>;
         <span class="self">self</span>.offset.fmt(f)
     }
 }

 <span class="doccomment">/// Accepts a relaxed form of RFC3339.
 /// A space or a &#39;T&#39; are acepted as the separator between the date and time
 /// parts.
 ///
 /// All of these examples are equivalent:
 /// ```
 /// # use chrono::{DateTime, Utc};
 /// &quot;2012-12-12T12:12:12Z&quot;.parse::&lt;DateTime&lt;Utc&gt;&gt;()?;
 /// &quot;2012-12-12 12:12:12Z&quot;.parse::&lt;DateTime&lt;Utc&gt;&gt;()?;
 /// &quot;2012-12-12 12:12:12+0000&quot;.parse::&lt;DateTime&lt;Utc&gt;&gt;()?;
 /// &quot;2012-12-12 12:12:12+00:00&quot;.parse::&lt;DateTime&lt;Utc&gt;&gt;()?;
 /// # Ok::&lt;(), chrono::ParseError&gt;(())
 /// ```
 </span><span class="kw">impl </span>str::FromStr <span class="kw">for </span>DateTime&lt;Utc&gt; {
     <span class="kw">type </span><span class="prelude-val">Err </span>= ParseError;

     <span class="kw">fn </span>from_str(s: <span class="kw-2">&amp;</span>str) -&gt; ParseResult&lt;DateTime&lt;Utc&gt;&gt; {
         s.parse::&lt;DateTime&lt;FixedOffset&gt;&gt;().map(|dt| dt.with_timezone(<span class="kw-2">&amp;</span>Utc))
     }
 }

 <span class="doccomment">/// Accepts a relaxed form of RFC3339.
 /// A space or a &#39;T&#39; are acepted as the separator between the date and time
 /// parts.
 ///
 /// All of these examples are equivalent:
 /// ```
 /// # use chrono::{DateTime, Local};
 /// &quot;2012-12-12T12:12:12Z&quot;.parse::&lt;DateTime&lt;Local&gt;&gt;()?;
 /// &quot;2012-12-12 12:12:12Z&quot;.parse::&lt;DateTime&lt;Local&gt;&gt;()?;
 /// &quot;2012-12-12 12:12:12+0000&quot;.parse::&lt;DateTime&lt;Local&gt;&gt;()?;
 /// &quot;2012-12-12 12:12:12+00:00&quot;.parse::&lt;DateTime&lt;Local&gt;&gt;()?;
 /// # Ok::&lt;(), chrono::ParseError&gt;(())
 /// ```
 </span><span class="attribute">#[cfg(feature = <span class="string">&quot;clock&quot;</span>)]
 #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;clock&quot;</span>)))]
 </span><span class="kw">impl </span>str::FromStr <span class="kw">for </span>DateTime&lt;Local&gt; {
     <span class="kw">type </span><span class="prelude-val">Err </span>= ParseError;

     <span class="kw">fn </span>from_str(s: <span class="kw-2">&amp;</span>str) -&gt; ParseResult&lt;DateTime&lt;Local&gt;&gt; {
         s.parse::&lt;DateTime&lt;FixedOffset&gt;&gt;().map(|dt| dt.with_timezone(<span class="kw-2">&amp;</span>Local))
     }
 }

 <span class="attribute">#[cfg(any(feature = <span class="string">&quot;std&quot;</span>, test))]
 #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;std&quot;</span>)))]
 </span><span class="kw">impl </span>From&lt;SystemTime&gt; <span class="kw">for </span>DateTime&lt;Utc&gt; {
     <span class="kw">fn </span>from(t: SystemTime) -&gt; DateTime&lt;Utc&gt; {
         <span class="kw">let </span>(sec, nsec) = <span class="kw">match </span>t.duration_since(UNIX_EPOCH) {
             <span class="prelude-val">Ok</span>(dur) =&gt; (dur.as_secs() <span class="kw">as </span>i64, dur.subsec_nanos()),
             <span class="prelude-val">Err</span>(e) =&gt; {
                 <span class="comment">// unlikely but should be handled
                 </span><span class="kw">let </span>dur = e.duration();
                 <span class="kw">let </span>(sec, nsec) = (dur.as_secs() <span class="kw">as </span>i64, dur.subsec_nanos());
                 <span class="kw">if </span>nsec == <span class="number">0 </span>{
                     (-sec, <span class="number">0</span>)
                 } <span class="kw">else </span>{
                     (-sec - <span class="number">1</span>, <span class="number">1_000_000_000 </span>- nsec)
                 }
             }
         };
         Utc.timestamp_opt(sec, nsec).unwrap()
     }
 }

 <span class="attribute">#[cfg(feature = <span class="string">&quot;clock&quot;</span>)]
 #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;clock&quot;</span>)))]
 </span><span class="kw">impl </span>From&lt;SystemTime&gt; <span class="kw">for </span>DateTime&lt;Local&gt; {
     <span class="kw">fn </span>from(t: SystemTime) -&gt; DateTime&lt;Local&gt; {
         DateTime::&lt;Utc&gt;::from(t).with_timezone(<span class="kw-2">&amp;</span>Local)
     }
 }

 <span class="attribute">#[cfg(any(feature = <span class="string">&quot;std&quot;</span>, test))]
 #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;std&quot;</span>)))]
 </span><span class="kw">impl</span>&lt;Tz: TimeZone&gt; From&lt;DateTime&lt;Tz&gt;&gt; <span class="kw">for </span>SystemTime {
     <span class="kw">fn </span>from(dt: DateTime&lt;Tz&gt;) -&gt; SystemTime {
         <span class="kw">use </span>std::time::Duration;

         <span class="kw">let </span>sec = dt.timestamp();
         <span class="kw">let </span>nsec = dt.timestamp_subsec_nanos();
         <span class="kw">if </span>sec &lt; <span class="number">0 </span>{
             <span class="comment">// unlikely but should be handled
             </span>UNIX_EPOCH - Duration::new(-sec <span class="kw">as </span>u64, <span class="number">0</span>) + Duration::new(<span class="number">0</span>, nsec)
         } <span class="kw">else </span>{
             UNIX_EPOCH + Duration::new(sec <span class="kw">as </span>u64, nsec)
         }
     }
 }

 <span class="attribute">#[cfg(all(
     target_arch = <span class="string">&quot;wasm32&quot;</span>,
     feature = <span class="string">&quot;wasmbind&quot;</span>,
     not(any(target_os = <span class="string">&quot;emscripten&quot;</span>, target_os = <span class="string">&quot;wasi&quot;</span>))
 ))]
 #[cfg_attr(
     docsrs,
     doc(cfg(all(
         target_arch = <span class="string">&quot;wasm32&quot;</span>,
         feature = <span class="string">&quot;wasmbind&quot;</span>,
         not(any(target_os = <span class="string">&quot;emscripten&quot;</span>, target_os = <span class="string">&quot;wasi&quot;</span>))
     )))
 )]
 </span><span class="kw">impl </span>From&lt;js_sys::Date&gt; <span class="kw">for </span>DateTime&lt;Utc&gt; {
     <span class="kw">fn </span>from(date: js_sys::Date) -&gt; DateTime&lt;Utc&gt; {
         DateTime::&lt;Utc&gt;::from(<span class="kw-2">&amp;</span>date)
     }
 }

 <span class="attribute">#[cfg(all(
     target_arch = <span class="string">&quot;wasm32&quot;</span>,
     feature = <span class="string">&quot;wasmbind&quot;</span>,
     not(any(target_os = <span class="string">&quot;emscripten&quot;</span>, target_os = <span class="string">&quot;wasi&quot;</span>))
 ))]
 #[cfg_attr(
     docsrs,
     doc(cfg(all(
         target_arch = <span class="string">&quot;wasm32&quot;</span>,
         feature = <span class="string">&quot;wasmbind&quot;</span>,
         not(any(target_os = <span class="string">&quot;emscripten&quot;</span>, target_os = <span class="string">&quot;wasi&quot;</span>))
     )))
 )]
 </span><span class="kw">impl </span>From&lt;<span class="kw-2">&amp;</span>js_sys::Date&gt; <span class="kw">for </span>DateTime&lt;Utc&gt; {
     <span class="kw">fn </span>from(date: <span class="kw-2">&amp;</span>js_sys::Date) -&gt; DateTime&lt;Utc&gt; {
         Utc.timestamp_millis_opt(date.get_time() <span class="kw">as </span>i64).unwrap()
     }
 }

 <span class="attribute">#[cfg(all(
     target_arch = <span class="string">&quot;wasm32&quot;</span>,
     feature = <span class="string">&quot;wasmbind&quot;</span>,
     not(any(target_os = <span class="string">&quot;emscripten&quot;</span>, target_os = <span class="string">&quot;wasi&quot;</span>))
 ))]
 #[cfg_attr(
     docsrs,
     doc(cfg(all(
         target_arch = <span class="string">&quot;wasm32&quot;</span>,
         feature = <span class="string">&quot;wasmbind&quot;</span>,
         not(any(target_os = <span class="string">&quot;emscripten&quot;</span>, target_os = <span class="string">&quot;wasi&quot;</span>))
     )))
 )]
 </span><span class="kw">impl </span>From&lt;DateTime&lt;Utc&gt;&gt; <span class="kw">for </span>js_sys::Date {
     <span class="doccomment">/// Converts a `DateTime&lt;Utc&gt;` to a JS `Date`. The resulting value may be lossy,
     /// any values that have a millisecond timestamp value greater/less than ±8,640,000,000,000,000
     /// (April 20, 271821 BCE ~ September 13, 275760 CE) will become invalid dates in JS.
     </span><span class="kw">fn </span>from(date: DateTime&lt;Utc&gt;) -&gt; js_sys::Date {
         <span class="kw">let </span>js_millis = wasm_bindgen::JsValue::from_f64(date.timestamp_millis() <span class="kw">as </span>f64);
         js_sys::Date::new(<span class="kw-2">&amp;</span>js_millis)
     }
 }

 <span class="comment">// Note that implementation of Arbitrary cannot be simply derived for DateTime&lt;Tz&gt;, due to
 // the nontrivial bound &lt;Tz as TimeZone&gt;::Offset: Arbitrary.
 </span><span class="attribute">#[cfg(feature = <span class="string">&quot;arbitrary&quot;</span>)]
 </span><span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, Tz&gt; arbitrary::Arbitrary&lt;<span class="lifetime">&#39;a</span>&gt; <span class="kw">for </span>DateTime&lt;Tz&gt;
 <span class="kw">where
     </span>Tz: TimeZone,
     &lt;Tz <span class="kw">as </span>TimeZone&gt;::Offset: arbitrary::Arbitrary&lt;<span class="lifetime">&#39;a</span>&gt;,
 {
     <span class="kw">fn </span>arbitrary(u: <span class="kw-2">&amp;mut </span>arbitrary::Unstructured&lt;<span class="lifetime">&#39;a</span>&gt;) -&gt; arbitrary::Result&lt;DateTime&lt;Tz&gt;&gt; {
         <span class="kw">let </span>datetime = NaiveDateTime::arbitrary(u)<span class="question-mark">?</span>;
         <span class="kw">let </span>offset = &lt;Tz <span class="kw">as </span>TimeZone&gt;::Offset::arbitrary(u)<span class="question-mark">?</span>;
         <span class="prelude-val">Ok</span>(DateTime::from_utc(datetime, offset))
     }
 }

 <span class="attribute">#[test]
 </span><span class="kw">fn </span>test_add_sub_months() {
     <span class="kw">let </span>utc_dt = Utc.with_ymd_and_hms(<span class="number">2018</span>, <span class="number">9</span>, <span class="number">5</span>, <span class="number">23</span>, <span class="number">58</span>, <span class="number">0</span>).unwrap();
     <span class="macro">assert_eq!</span>(utc_dt + Months::new(<span class="number">15</span>), Utc.with_ymd_and_hms(<span class="number">2019</span>, <span class="number">12</span>, <span class="number">5</span>, <span class="number">23</span>, <span class="number">58</span>, <span class="number">0</span>).unwrap());

     <span class="kw">let </span>utc_dt = Utc.with_ymd_and_hms(<span class="number">2020</span>, <span class="number">1</span>, <span class="number">31</span>, <span class="number">23</span>, <span class="number">58</span>, <span class="number">0</span>).unwrap();
     <span class="macro">assert_eq!</span>(utc_dt + Months::new(<span class="number">1</span>), Utc.with_ymd_and_hms(<span class="number">2020</span>, <span class="number">2</span>, <span class="number">29</span>, <span class="number">23</span>, <span class="number">58</span>, <span class="number">0</span>).unwrap());
     <span class="macro">assert_eq!</span>(utc_dt + Months::new(<span class="number">2</span>), Utc.with_ymd_and_hms(<span class="number">2020</span>, <span class="number">3</span>, <span class="number">31</span>, <span class="number">23</span>, <span class="number">58</span>, <span class="number">0</span>).unwrap());

     <span class="kw">let </span>utc_dt = Utc.with_ymd_and_hms(<span class="number">2018</span>, <span class="number">9</span>, <span class="number">5</span>, <span class="number">23</span>, <span class="number">58</span>, <span class="number">0</span>).unwrap();
     <span class="macro">assert_eq!</span>(utc_dt - Months::new(<span class="number">15</span>), Utc.with_ymd_and_hms(<span class="number">2017</span>, <span class="number">6</span>, <span class="number">5</span>, <span class="number">23</span>, <span class="number">58</span>, <span class="number">0</span>).unwrap());

     <span class="kw">let </span>utc_dt = Utc.with_ymd_and_hms(<span class="number">2020</span>, <span class="number">3</span>, <span class="number">31</span>, <span class="number">23</span>, <span class="number">58</span>, <span class="number">0</span>).unwrap();
     <span class="macro">assert_eq!</span>(utc_dt - Months::new(<span class="number">1</span>), Utc.with_ymd_and_hms(<span class="number">2020</span>, <span class="number">2</span>, <span class="number">29</span>, <span class="number">23</span>, <span class="number">58</span>, <span class="number">0</span>).unwrap());
     <span class="macro">assert_eq!</span>(utc_dt - Months::new(<span class="number">2</span>), Utc.with_ymd_and_hms(<span class="number">2020</span>, <span class="number">1</span>, <span class="number">31</span>, <span class="number">23</span>, <span class="number">58</span>, <span class="number">0</span>).unwrap());
 }

 <span class="attribute">#[test]
 </span><span class="kw">fn </span>test_auto_conversion() {
     <span class="kw">let </span>utc_dt = Utc.with_ymd_and_hms(<span class="number">2018</span>, <span class="number">9</span>, <span class="number">5</span>, <span class="number">23</span>, <span class="number">58</span>, <span class="number">0</span>).unwrap();
     <span class="kw">let </span>cdt_dt = FixedOffset::west_opt(<span class="number">5 </span>* <span class="number">60 </span>* <span class="number">60</span>)
         .unwrap()
         .with_ymd_and_hms(<span class="number">2018</span>, <span class="number">9</span>, <span class="number">5</span>, <span class="number">18</span>, <span class="number">58</span>, <span class="number">0</span>)
         .unwrap();
     <span class="kw">let </span>utc_dt2: DateTime&lt;Utc&gt; = cdt_dt.into();
     <span class="macro">assert_eq!</span>(utc_dt, utc_dt2);
 }

 <span class="attribute">#[cfg(all(test, any(feature = <span class="string">&quot;rustc-serialize&quot;</span>, feature = <span class="string">&quot;serde&quot;</span>)))]
 </span><span class="kw">fn </span>test_encodable_json&lt;FUtc, FFixed, E&gt;(to_string_utc: FUtc, to_string_fixed: FFixed)
 <span class="kw">where
     </span>FUtc: Fn(<span class="kw-2">&amp;</span>DateTime&lt;Utc&gt;) -&gt; <span class="prelude-ty">Result</span>&lt;String, E&gt;,
     FFixed: Fn(<span class="kw-2">&amp;</span>DateTime&lt;FixedOffset&gt;) -&gt; <span class="prelude-ty">Result</span>&lt;String, E&gt;,
     E: ::core::fmt::Debug,
 {
     <span class="macro">assert_eq!</span>(
         to_string_utc(<span class="kw-2">&amp;</span>Utc.with_ymd_and_hms(<span class="number">2014</span>, <span class="number">7</span>, <span class="number">24</span>, <span class="number">12</span>, <span class="number">34</span>, <span class="number">6</span>).unwrap()).ok(),
         <span class="prelude-val">Some</span>(<span class="string">r#&quot;&quot;2014-07-24T12:34:06Z&quot;&quot;#</span>.into())
     );

     <span class="macro">assert_eq!</span>(
         to_string_fixed(
             <span class="kw-2">&amp;</span>FixedOffset::east_opt(<span class="number">3660</span>).unwrap().with_ymd_and_hms(<span class="number">2014</span>, <span class="number">7</span>, <span class="number">24</span>, <span class="number">12</span>, <span class="number">34</span>, <span class="number">6</span>).unwrap()
         )
         .ok(),
         <span class="prelude-val">Some</span>(<span class="string">r#&quot;&quot;2014-07-24T12:34:06+01:01&quot;&quot;#</span>.into())
     );
     <span class="macro">assert_eq!</span>(
         to_string_fixed(
             <span class="kw-2">&amp;</span>FixedOffset::east_opt(<span class="number">3650</span>).unwrap().with_ymd_and_hms(<span class="number">2014</span>, <span class="number">7</span>, <span class="number">24</span>, <span class="number">12</span>, <span class="number">34</span>, <span class="number">6</span>).unwrap()
         )
         .ok(),
         <span class="prelude-val">Some</span>(<span class="string">r#&quot;&quot;2014-07-24T12:34:06+01:00:50&quot;&quot;#</span>.into())
     );
 }

 <span class="attribute">#[cfg(all(test, feature = <span class="string">&quot;clock&quot;</span>, any(feature = <span class="string">&quot;rustc-serialize&quot;</span>, feature = <span class="string">&quot;serde&quot;</span>)))]
 </span><span class="kw">fn </span>test_decodable_json&lt;FUtc, FFixed, FLocal, E&gt;(
     utc_from_str: FUtc,
     fixed_from_str: FFixed,
     local_from_str: FLocal,
 ) <span class="kw">where
     </span>FUtc: Fn(<span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;DateTime&lt;Utc&gt;, E&gt;,
     FFixed: Fn(<span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;DateTime&lt;FixedOffset&gt;, E&gt;,
     FLocal: Fn(<span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;DateTime&lt;Local&gt;, E&gt;,
     E: ::core::fmt::Debug,
 {
     <span class="comment">// should check against the offset as well (the normal DateTime comparison will ignore them)
     </span><span class="kw">fn </span>norm&lt;Tz: TimeZone&gt;(dt: <span class="kw-2">&amp;</span><span class="prelude-ty">Option</span>&lt;DateTime&lt;Tz&gt;&gt;) -&gt; <span class="prelude-ty">Option</span>&lt;(<span class="kw-2">&amp;</span>DateTime&lt;Tz&gt;, <span class="kw-2">&amp;</span>Tz::Offset)&gt; {
         dt.as_ref().map(|dt| (dt, dt.offset()))
     }

     <span class="macro">assert_eq!</span>(
         norm(<span class="kw-2">&amp;</span>utc_from_str(<span class="string">r#&quot;&quot;2014-07-24T12:34:06Z&quot;&quot;#</span>).ok()),
         norm(<span class="kw-2">&amp;</span><span class="prelude-val">Some</span>(Utc.with_ymd_and_hms(<span class="number">2014</span>, <span class="number">7</span>, <span class="number">24</span>, <span class="number">12</span>, <span class="number">34</span>, <span class="number">6</span>).unwrap()))
     );
     <span class="macro">assert_eq!</span>(
         norm(<span class="kw-2">&amp;</span>utc_from_str(<span class="string">r#&quot;&quot;2014-07-24T13:57:06+01:23&quot;&quot;#</span>).ok()),
         norm(<span class="kw-2">&amp;</span><span class="prelude-val">Some</span>(Utc.with_ymd_and_hms(<span class="number">2014</span>, <span class="number">7</span>, <span class="number">24</span>, <span class="number">12</span>, <span class="number">34</span>, <span class="number">6</span>).unwrap()))
     );

     <span class="macro">assert_eq!</span>(
         norm(<span class="kw-2">&amp;</span>fixed_from_str(<span class="string">r#&quot;&quot;2014-07-24T12:34:06Z&quot;&quot;#</span>).ok()),
         norm(<span class="kw-2">&amp;</span><span class="prelude-val">Some</span>(
             FixedOffset::east_opt(<span class="number">0</span>).unwrap().with_ymd_and_hms(<span class="number">2014</span>, <span class="number">7</span>, <span class="number">24</span>, <span class="number">12</span>, <span class="number">34</span>, <span class="number">6</span>).unwrap()
         ))
     );
     <span class="macro">assert_eq!</span>(
         norm(<span class="kw-2">&amp;</span>fixed_from_str(<span class="string">r#&quot;&quot;2014-07-24T13:57:06+01:23&quot;&quot;#</span>).ok()),
         norm(<span class="kw-2">&amp;</span><span class="prelude-val">Some</span>(
             FixedOffset::east_opt(<span class="number">60 </span>* <span class="number">60 </span>+ <span class="number">23 </span>* <span class="number">60</span>)
                 .unwrap()
                 .with_ymd_and_hms(<span class="number">2014</span>, <span class="number">7</span>, <span class="number">24</span>, <span class="number">13</span>, <span class="number">57</span>, <span class="number">6</span>)
                 .unwrap()
         ))
     );

     <span class="comment">// we don&#39;t know the exact local offset but we can check that
     // the conversion didn&#39;t change the instant itself
     </span><span class="macro">assert_eq!</span>(
         local_from_str(<span class="string">r#&quot;&quot;2014-07-24T12:34:06Z&quot;&quot;#</span>).expect(<span class="string">&quot;local shouuld parse&quot;</span>),
         Utc.with_ymd_and_hms(<span class="number">2014</span>, <span class="number">7</span>, <span class="number">24</span>, <span class="number">12</span>, <span class="number">34</span>, <span class="number">6</span>).unwrap()
     );
     <span class="macro">assert_eq!</span>(
         local_from_str(<span class="string">r#&quot;&quot;2014-07-24T13:57:06+01:23&quot;&quot;#</span>).expect(<span class="string">&quot;local should parse with offset&quot;</span>),
         Utc.with_ymd_and_hms(<span class="number">2014</span>, <span class="number">7</span>, <span class="number">24</span>, <span class="number">12</span>, <span class="number">34</span>, <span class="number">6</span>).unwrap()
     );

     <span class="macro">assert!</span>(utc_from_str(<span class="string">r#&quot;&quot;2014-07-32T12:34:06Z&quot;&quot;#</span>).is_err());
     <span class="macro">assert!</span>(fixed_from_str(<span class="string">r#&quot;&quot;2014-07-32T12:34:06Z&quot;&quot;#</span>).is_err());
 }

 <span class="attribute">#[cfg(all(test, feature = <span class="string">&quot;clock&quot;</span>, feature = <span class="string">&quot;rustc-serialize&quot;</span>))]
 </span><span class="kw">fn </span>test_decodable_json_timestamps&lt;FUtc, FFixed, FLocal, E&gt;(
     utc_from_str: FUtc,
     fixed_from_str: FFixed,
     local_from_str: FLocal,
 ) <span class="kw">where
     </span>FUtc: Fn(<span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;rustc_serialize::TsSeconds&lt;Utc&gt;, E&gt;,
     FFixed: Fn(<span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;rustc_serialize::TsSeconds&lt;FixedOffset&gt;, E&gt;,
     FLocal: Fn(<span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;rustc_serialize::TsSeconds&lt;Local&gt;, E&gt;,
     E: ::core::fmt::Debug,
 {
     <span class="kw">fn </span>norm&lt;Tz: TimeZone&gt;(dt: <span class="kw-2">&amp;</span><span class="prelude-ty">Option</span>&lt;DateTime&lt;Tz&gt;&gt;) -&gt; <span class="prelude-ty">Option</span>&lt;(<span class="kw-2">&amp;</span>DateTime&lt;Tz&gt;, <span class="kw-2">&amp;</span>Tz::Offset)&gt; {
         dt.as_ref().map(|dt| (dt, dt.offset()))
     }

     <span class="macro">assert_eq!</span>(
         norm(<span class="kw-2">&amp;</span>utc_from_str(<span class="string">&quot;0&quot;</span>).ok().map(DateTime::from)),
         norm(<span class="kw-2">&amp;</span><span class="prelude-val">Some</span>(Utc.with_ymd_and_hms(<span class="number">1970</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>).unwrap()))
     );
     <span class="macro">assert_eq!</span>(
         norm(<span class="kw-2">&amp;</span>utc_from_str(<span class="string">&quot;-1&quot;</span>).ok().map(DateTime::from)),
         norm(<span class="kw-2">&amp;</span><span class="prelude-val">Some</span>(Utc.with_ymd_and_hms(<span class="number">1969</span>, <span class="number">12</span>, <span class="number">31</span>, <span class="number">23</span>, <span class="number">59</span>, <span class="number">59</span>).unwrap()))
     );

     <span class="macro">assert_eq!</span>(
         norm(<span class="kw-2">&amp;</span>fixed_from_str(<span class="string">&quot;0&quot;</span>).ok().map(DateTime::from)),
         norm(<span class="kw-2">&amp;</span><span class="prelude-val">Some</span>(
             FixedOffset::east_opt(<span class="number">0</span>).unwrap().with_ymd_and_hms(<span class="number">1970</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>).unwrap()
         ))
     );
     <span class="macro">assert_eq!</span>(
         norm(<span class="kw-2">&amp;</span>fixed_from_str(<span class="string">&quot;-1&quot;</span>).ok().map(DateTime::from)),
         norm(<span class="kw-2">&amp;</span><span class="prelude-val">Some</span>(
             FixedOffset::east_opt(<span class="number">0</span>).unwrap().with_ymd_and_hms(<span class="number">1969</span>, <span class="number">12</span>, <span class="number">31</span>, <span class="number">23</span>, <span class="number">59</span>, <span class="number">59</span>).unwrap()
         ))
     );

     <span class="macro">assert_eq!</span>(
         <span class="kw-2">*</span>fixed_from_str(<span class="string">&quot;0&quot;</span>).expect(<span class="string">&quot;0 timestamp should parse&quot;</span>),
         Utc.with_ymd_and_hms(<span class="number">1970</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>).unwrap()
     );
     <span class="macro">assert_eq!</span>(
         <span class="kw-2">*</span>local_from_str(<span class="string">&quot;-1&quot;</span>).expect(<span class="string">&quot;-1 timestamp should parse&quot;</span>),
         Utc.with_ymd_and_hms(<span class="number">1969</span>, <span class="number">12</span>, <span class="number">31</span>, <span class="number">23</span>, <span class="number">59</span>, <span class="number">59</span>).unwrap()
     );
 }
 </code></pre></div>
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