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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/format/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">//! Formatting (and parsing) utilities for date and time.
 //!
 //! This module provides the common types and routines to implement,
 //! for example, [`DateTime::format`](../struct.DateTime.html#method.format) or
 //! [`DateTime::parse_from_str`](../struct.DateTime.html#method.parse_from_str) methods.
 //! For most cases you should use these high-level interfaces.
 //!
 //! Internally the formatting and parsing shares the same abstract **formatting items**,
 //! which are just an [`Iterator`](https://doc.rust-lang.org/std/iter/trait.Iterator.html) of
 //! the [`Item`](./enum.Item.html) type.
 //! They are generated from more readable **format strings**;
 //! currently Chrono supports a built-in syntax closely resembling
 //! C&#39;s `strftime` format. The available options can be found [here](./strftime/index.html).
 //!
 //! # Example
 </span><span class="attribute">#![cfg_attr(not(feature = <span class="string">&quot;std&quot;</span>), doc = <span class="string">&quot;```ignore&quot;</span>)]
 #![cfg_attr(feature = <span class="string">&quot;std&quot;</span>, doc = <span class="string">&quot;```rust&quot;</span>)]
 </span><span class="doccomment">//! use chrono::{TimeZone, Utc};
 //!
 //! let date_time = Utc.with_ymd_and_hms(2020, 11, 10, 0, 1, 32).unwrap();
 //!
 //! let formatted = format!(&quot;{}&quot;, date_time.format(&quot;%Y-%m-%d %H:%M:%S&quot;));
 //! assert_eq!(formatted, &quot;2020-11-10 00:01:32&quot;);
 //!
 //! let parsed = Utc.datetime_from_str(&amp;formatted, &quot;%Y-%m-%d %H:%M:%S&quot;)?;
 //! assert_eq!(parsed, date_time);
 //! # Ok::&lt;(), chrono::ParseError&gt;(())
 //! ```

 </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(feature = <span class="string">&quot;alloc&quot;</span>)]
 </span><span class="kw">use </span>alloc::boxed::Box;
 <span class="attribute">#[cfg(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::fmt;
 <span class="kw">use </span>core::fmt::Write;
 <span class="kw">use </span>core::str::FromStr;
 <span class="attribute">#[cfg(any(feature = <span class="string">&quot;std&quot;</span>, test))]
 </span><span class="kw">use </span>std::error::Error;

 <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>::naive::{NaiveDate, NaiveTime};
 <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>::offset::{FixedOffset, Offset};
 <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 crate</span>::{Datelike, Timelike};
 <span class="kw">use crate</span>::{Month, ParseMonthError, ParseWeekdayError, Weekday};

 <span class="attribute">#[cfg(feature = <span class="string">&quot;unstable-locales&quot;</span>)]
 </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod </span>locales;

 <span class="kw">pub use </span>parse::{parse, parse_and_remainder};
 <span class="kw">pub use </span>parsed::Parsed;
 <span class="doccomment">/// L10n locales.
 </span><span class="attribute">#[cfg(feature = <span class="string">&quot;unstable-locales&quot;</span>)]
 </span><span class="kw">pub use </span>pure_rust_locales::Locale;
 <span class="kw">pub use </span>strftime::StrftimeItems;

 <span class="attribute">#[cfg(not(feature = <span class="string">&quot;unstable-locales&quot;</span>))]
 #[allow(dead_code)]
 #[derive(Debug)]
 </span><span class="kw">struct </span>Locale;

 <span class="doccomment">/// An uninhabited type used for `InternalNumeric` and `InternalFixed` below.
 </span><span class="attribute">#[derive(Clone, PartialEq, Eq, Hash)]
 </span><span class="kw">enum </span>Void {}

 <span class="doccomment">/// Padding characters for numeric items.
 </span><span class="attribute">#[derive(Copy, Clone, PartialEq, Eq, Debug, Hash)]
 </span><span class="kw">pub enum </span>Pad {
     <span class="doccomment">/// No padding.
     </span><span class="prelude-val">None</span>,
     <span class="doccomment">/// Zero (`0`) padding.
     </span>Zero,
     <span class="doccomment">/// Space padding.
     </span>Space,
 }

 <span class="doccomment">/// Numeric item types.
 /// They have associated formatting width (FW) and parsing width (PW).
 ///
 /// The **formatting width** is the minimal width to be formatted.
 /// If the number is too short, and the padding is not [`Pad::None`](./enum.Pad.html#variant.None),
 /// then it is left-padded.
 /// If the number is too long or (in some cases) negative, it is printed as is.
 ///
 /// The **parsing width** is the maximal width to be scanned.
 /// The parser only tries to consume from one to given number of digits (greedily).
 /// It also trims the preceding whitespace if any.
 /// It cannot parse the negative number, so some date and time cannot be formatted then
 /// parsed with the same formatting items.
 </span><span class="attribute">#[derive(Clone, PartialEq, Eq, Debug, Hash)]
 </span><span class="kw">pub enum </span>Numeric {
     <span class="doccomment">/// Full Gregorian year (FW=4, PW=∞).
     /// May accept years before 1 BCE or after 9999 CE, given an initial sign (+/-).
     </span>Year,
     <span class="doccomment">/// Gregorian year divided by 100 (century number; FW=PW=2). Implies the non-negative year.
     </span>YearDiv100,
     <span class="doccomment">/// Gregorian year modulo 100 (FW=PW=2). Cannot be negative.
     </span>YearMod100,
     <span class="doccomment">/// Year in the ISO week date (FW=4, PW=∞).
     /// May accept years before 1 BCE or after 9999 CE, given an initial sign.
     </span>IsoYear,
     <span class="doccomment">/// Year in the ISO week date, divided by 100 (FW=PW=2). Implies the non-negative year.
     </span>IsoYearDiv100,
     <span class="doccomment">/// Year in the ISO week date, modulo 100 (FW=PW=2). Cannot be negative.
     </span>IsoYearMod100,
     <span class="doccomment">/// Month (FW=PW=2).
     </span>Month,
     <span class="doccomment">/// Day of the month (FW=PW=2).
     </span>Day,
     <span class="doccomment">/// Week number, where the week 1 starts at the first Sunday of January (FW=PW=2).
     </span>WeekFromSun,
     <span class="doccomment">/// Week number, where the week 1 starts at the first Monday of January (FW=PW=2).
     </span>WeekFromMon,
     <span class="doccomment">/// Week number in the ISO week date (FW=PW=2).
     </span>IsoWeek,
     <span class="doccomment">/// Day of the week, where Sunday = 0 and Saturday = 6 (FW=PW=1).
     </span>NumDaysFromSun,
     <span class="doccomment">/// Day of the week, where Monday = 1 and Sunday = 7 (FW=PW=1).
     </span>WeekdayFromMon,
     <span class="doccomment">/// Day of the year (FW=PW=3).
     </span>Ordinal,
     <span class="doccomment">/// Hour number in the 24-hour clocks (FW=PW=2).
     </span>Hour,
     <span class="doccomment">/// Hour number in the 12-hour clocks (FW=PW=2).
     </span>Hour12,
     <span class="doccomment">/// The number of minutes since the last whole hour (FW=PW=2).
     </span>Minute,
     <span class="doccomment">/// The number of seconds since the last whole minute (FW=PW=2).
     </span>Second,
     <span class="doccomment">/// The number of nanoseconds since the last whole second (FW=PW=9).
     /// Note that this is *not* left-aligned;
     /// see also [`Fixed::Nanosecond`](./enum.Fixed.html#variant.Nanosecond).
     </span>Nanosecond,
     <span class="doccomment">/// The number of non-leap seconds since the midnight UTC on January 1, 1970 (FW=1, PW=∞).
     /// For formatting, it assumes UTC upon the absence of time zone offset.
     </span>Timestamp,

     <span class="doccomment">/// Internal uses only.
     ///
     /// This item exists so that one can add additional internal-only formatting
     /// without breaking major compatibility (as enum variants cannot be selectively private).
     </span>Internal(InternalNumeric),
 }

 <span class="doccomment">/// An opaque type representing numeric item types for internal uses only.
 </span><span class="attribute">#[derive(Clone, Eq, Hash, PartialEq)]
 </span><span class="kw">pub struct </span>InternalNumeric {
     _dummy: Void,
 }

 <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>InternalNumeric {
     <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="macro">write!</span>(f, <span class="string">&quot;&lt;InternalNumeric&gt;&quot;</span>)
     }
 }

 <span class="doccomment">/// Fixed-format item types.
 ///
 /// They have their own rules of formatting and parsing.
 /// Otherwise noted, they print in the specified cases but parse case-insensitively.
 </span><span class="attribute">#[derive(Clone, PartialEq, Eq, Debug, Hash)]
 </span><span class="kw">pub enum </span>Fixed {
     <span class="doccomment">/// Abbreviated month names.
     ///
     /// Prints a three-letter-long name in the title case, reads the same name in any case.
     </span>ShortMonthName,
     <span class="doccomment">/// Full month names.
     ///
     /// Prints a full name in the title case, reads either a short or full name in any case.
     </span>LongMonthName,
     <span class="doccomment">/// Abbreviated day of the week names.
     ///
     /// Prints a three-letter-long name in the title case, reads the same name in any case.
     </span>ShortWeekdayName,
     <span class="doccomment">/// Full day of the week names.
     ///
     /// Prints a full name in the title case, reads either a short or full name in any case.
     </span>LongWeekdayName,
     <span class="doccomment">/// AM/PM.
     ///
     /// Prints in lower case, reads in any case.
     </span>LowerAmPm,
     <span class="doccomment">/// AM/PM.
     ///
     /// Prints in upper case, reads in any case.
     </span>UpperAmPm,
     <span class="doccomment">/// An optional dot plus one or more digits for left-aligned nanoseconds.
     /// May print nothing, 3, 6 or 9 digits according to the available accuracy.
     /// See also [`Numeric::Nanosecond`](./enum.Numeric.html#variant.Nanosecond).
     </span>Nanosecond,
     <span class="doccomment">/// Same as [`Nanosecond`](#variant.Nanosecond) but the accuracy is fixed to 3.
     </span>Nanosecond3,
     <span class="doccomment">/// Same as [`Nanosecond`](#variant.Nanosecond) but the accuracy is fixed to 6.
     </span>Nanosecond6,
     <span class="doccomment">/// Same as [`Nanosecond`](#variant.Nanosecond) but the accuracy is fixed to 9.
     </span>Nanosecond9,
     <span class="doccomment">/// Timezone name.
     ///
     /// It does not support parsing, its use in the parser is an immediate failure.
     </span>TimezoneName,
     <span class="doccomment">/// Offset from the local time to UTC (`+09:00` or `-04:00` or `+00:00`).
     ///
     /// In the parser, the colon can be omitted and/or surrounded with any amount of whitespace.
     /// The offset is limited from `-24:00` to `+24:00`,
     /// which is the same as [`FixedOffset`](../offset/struct.FixedOffset.html)&#39;s range.
     </span>TimezoneOffsetColon,
     <span class="doccomment">/// Offset from the local time to UTC with seconds (`+09:00:00` or `-04:00:00` or `+00:00:00`).
     ///
     /// In the parser, the colon can be omitted and/or surrounded with any amount of whitespace.
     /// The offset is limited from `-24:00:00` to `+24:00:00`,
     /// which is the same as [`FixedOffset`](../offset/struct.FixedOffset.html)&#39;s range.
     </span>TimezoneOffsetDoubleColon,
     <span class="doccomment">/// Offset from the local time to UTC without minutes (`+09` or `-04` or `+00`).
     ///
     /// In the parser, the colon can be omitted and/or surrounded with any amount of whitespace.
     /// The offset is limited from `-24` to `+24`,
     /// which is the same as [`FixedOffset`](../offset/struct.FixedOffset.html)&#39;s range.
     </span>TimezoneOffsetTripleColon,
     <span class="doccomment">/// Offset from the local time to UTC (`+09:00` or `-04:00` or `Z`).
     ///
     /// In the parser, the colon can be omitted and/or surrounded with any amount of whitespace,
     /// and `Z` can be either in upper case or in lower case.
     /// The offset is limited from `-24:00` to `+24:00`,
     /// which is the same as [`FixedOffset`](../offset/struct.FixedOffset.html)&#39;s range.
     </span>TimezoneOffsetColonZ,
     <span class="doccomment">/// Same as [`TimezoneOffsetColon`](#variant.TimezoneOffsetColon) but prints no colon.
     /// Parsing allows an optional colon.
     </span>TimezoneOffset,
     <span class="doccomment">/// Same as [`TimezoneOffsetColonZ`](#variant.TimezoneOffsetColonZ) but prints no colon.
     /// Parsing allows an optional colon.
     </span>TimezoneOffsetZ,
     <span class="doccomment">/// RFC 2822 date and time syntax. Commonly used for email and MIME date and time.
     </span>RFC2822,
     <span class="doccomment">/// RFC 3339 &amp; ISO 8601 date and time syntax.
     </span>RFC3339,

     <span class="doccomment">/// Internal uses only.
     ///
     /// This item exists so that one can add additional internal-only formatting
     /// without breaking major compatibility (as enum variants cannot be selectively private).
     </span>Internal(InternalFixed),
 }

 <span class="doccomment">/// An opaque type representing fixed-format item types for internal uses only.
 </span><span class="attribute">#[derive(Debug, Clone, PartialEq, Eq, Hash)]
 </span><span class="kw">pub struct </span>InternalFixed {
     val: InternalInternal,
 }

 <span class="attribute">#[derive(Debug, Clone, PartialEq, Eq, Hash)]
 </span><span class="kw">enum </span>InternalInternal {
     <span class="doccomment">/// Same as [`TimezoneOffsetColonZ`](#variant.TimezoneOffsetColonZ), but
     /// allows missing minutes (per [ISO 8601][iso8601]).
     ///
     /// # Panics
     ///
     /// If you try to use this for printing.
     ///
     /// [iso8601]: https://en.wikipedia.org/wiki/ISO_8601#Time_offsets_from_UTC
     </span>TimezoneOffsetPermissive,
     <span class="doccomment">/// Same as [`Nanosecond`](#variant.Nanosecond) but the accuracy is fixed to 3 and there is no leading dot.
     </span>Nanosecond3NoDot,
     <span class="doccomment">/// Same as [`Nanosecond`](#variant.Nanosecond) but the accuracy is fixed to 6 and there is no leading dot.
     </span>Nanosecond6NoDot,
     <span class="doccomment">/// Same as [`Nanosecond`](#variant.Nanosecond) but the accuracy is fixed to 9 and there is no leading dot.
     </span>Nanosecond9NoDot,
 }

 <span class="attribute">#[cfg(any(feature = <span class="string">&quot;alloc&quot;</span>, feature = <span class="string">&quot;std&quot;</span>, test))]
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
 </span><span class="kw">enum </span>Colons {
     <span class="prelude-val">None</span>,
     Single,
     Double,
     Triple,
 }

 <span class="doccomment">/// A single formatting item. This is used for both formatting and parsing.
 </span><span class="attribute">#[derive(Clone, PartialEq, Eq, Debug, Hash)]
 </span><span class="kw">pub enum </span>Item&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="doccomment">/// A literally printed and parsed text.
     </span>Literal(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str),
     <span class="doccomment">/// Same as `Literal` but with the string owned by the item.
     </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>))))]
     </span>OwnedLiteral(Box&lt;str&gt;),
     <span class="doccomment">/// Whitespace. Prints literally but reads zero or more whitespace.
     </span>Space(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str),
     <span class="doccomment">/// Same as `Space` but with the string owned by the item.
     </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>))))]
     </span>OwnedSpace(Box&lt;str&gt;),
     <span class="doccomment">/// Numeric item. Can be optionally padded to the maximal length (if any) when formatting;
     /// the parser simply ignores any padded whitespace and zeroes.
     </span>Numeric(Numeric, Pad),
     <span class="doccomment">/// Fixed-format item.
     </span>Fixed(Fixed),
     <span class="doccomment">/// Issues a formatting error. Used to signal an invalid format string.
     </span>Error,
 }

 <span class="macro">macro_rules! </span>lit {
     (<span class="macro-nonterminal">$x</span>:expr) =&gt; {
         Item::Literal(<span class="macro-nonterminal">$x</span>)
     };
 }
 <span class="macro">macro_rules! </span>sp {
     (<span class="macro-nonterminal">$x</span>:expr) =&gt; {
         Item::Space(<span class="macro-nonterminal">$x</span>)
     };
 }
 <span class="macro">macro_rules! </span>num {
     (<span class="macro-nonterminal">$x</span>:ident) =&gt; {
         Item::Numeric(Numeric::<span class="macro-nonterminal">$x</span>, Pad::None)
     };
 }
 <span class="macro">macro_rules! </span>num0 {
     (<span class="macro-nonterminal">$x</span>:ident) =&gt; {
         Item::Numeric(Numeric::<span class="macro-nonterminal">$x</span>, Pad::Zero)
     };
 }
 <span class="macro">macro_rules! </span>nums {
     (<span class="macro-nonterminal">$x</span>:ident) =&gt; {
         Item::Numeric(Numeric::<span class="macro-nonterminal">$x</span>, Pad::Space)
     };
 }
 <span class="macro">macro_rules! </span>fix {
     (<span class="macro-nonterminal">$x</span>:ident) =&gt; {
         Item::Fixed(Fixed::<span class="macro-nonterminal">$x</span>)
     };
 }
 <span class="macro">macro_rules! </span>internal_fix {
     (<span class="macro-nonterminal">$x</span>:ident) =&gt; {
         Item::Fixed(Fixed::Internal(InternalFixed { val: InternalInternal::<span class="macro-nonterminal">$x </span>}))
     };
 }

 <span class="doccomment">/// An error from the `parse` function.
 </span><span class="attribute">#[derive(Debug, Clone, PartialEq, Eq, Copy, Hash)]
 </span><span class="kw">pub struct </span>ParseError(ParseErrorKind);

 <span class="kw">impl </span>ParseError {
     <span class="doccomment">/// The category of parse error
     </span><span class="kw">pub const fn </span>kind(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; ParseErrorKind {
         <span class="self">self</span>.<span class="number">0
     </span>}
 }

 <span class="doccomment">/// The category of parse error
 </span><span class="attribute">#[allow(clippy::manual_non_exhaustive)]
 #[derive(Debug, Clone, PartialEq, Eq, Copy, Hash)]
 </span><span class="kw">pub enum </span>ParseErrorKind {
     <span class="doccomment">/// Given field is out of permitted range.
     </span>OutOfRange,

     <span class="doccomment">/// There is no possible date and time value with given set of fields.
     ///
     /// This does not include the out-of-range conditions, which are trivially invalid.
     /// It includes the case that there are one or more fields that are inconsistent to each other.
     </span>Impossible,

     <span class="doccomment">/// Given set of fields is not enough to make a requested date and time value.
     ///
     /// Note that there *may* be a case that given fields constrain the possible values so much
     /// that there is a unique possible value. Chrono only tries to be correct for
     /// most useful sets of fields however, as such constraint solving can be expensive.
     </span>NotEnough,

     <span class="doccomment">/// The input string has some invalid character sequence for given formatting items.
     </span>Invalid,

     <span class="doccomment">/// The input string has been prematurely ended.
     </span>TooShort,

     <span class="doccomment">/// All formatting items have been read but there is a remaining input.
     </span>TooLong,

     <span class="doccomment">/// There was an error on the formatting string, or there were non-supported formating items.
     </span>BadFormat,

     <span class="comment">// TODO: Change this to `#[non_exhaustive]` (on the enum) with the next breaking release.
     </span><span class="attribute">#[doc(hidden)]
     </span>__Nonexhaustive,
 }

 <span class="doccomment">/// Same as `Result&lt;T, ParseError&gt;`.
 </span><span class="kw">pub type </span>ParseResult&lt;T&gt; = <span class="prelude-ty">Result</span>&lt;T, ParseError&gt;;

 <span class="kw">impl </span>fmt::Display <span class="kw">for </span>ParseError {
     <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="kw">match </span><span class="self">self</span>.<span class="number">0 </span>{
             ParseErrorKind::OutOfRange =&gt; <span class="macro">write!</span>(f, <span class="string">&quot;input is out of range&quot;</span>),
             ParseErrorKind::Impossible =&gt; <span class="macro">write!</span>(f, <span class="string">&quot;no possible date and time matching input&quot;</span>),
             ParseErrorKind::NotEnough =&gt; <span class="macro">write!</span>(f, <span class="string">&quot;input is not enough for unique date and time&quot;</span>),
             ParseErrorKind::Invalid =&gt; <span class="macro">write!</span>(f, <span class="string">&quot;input contains invalid characters&quot;</span>),
             ParseErrorKind::TooShort =&gt; <span class="macro">write!</span>(f, <span class="string">&quot;premature end of input&quot;</span>),
             ParseErrorKind::TooLong =&gt; <span class="macro">write!</span>(f, <span class="string">&quot;trailing input&quot;</span>),
             ParseErrorKind::BadFormat =&gt; <span class="macro">write!</span>(f, <span class="string">&quot;bad or unsupported format string&quot;</span>),
             <span class="kw">_ </span>=&gt; <span class="macro">unreachable!</span>(),
         }
     }
 }

 <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>Error <span class="kw">for </span>ParseError {
     <span class="attribute">#[allow(deprecated)]
     </span><span class="kw">fn </span>description(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>str {
         <span class="string">&quot;parser error, see to_string() for details&quot;
     </span>}
 }

 <span class="comment">// to be used in this module and submodules
 </span><span class="kw">const </span>OUT_OF_RANGE: ParseError = ParseError(ParseErrorKind::OutOfRange);
 <span class="kw">const </span>IMPOSSIBLE: ParseError = ParseError(ParseErrorKind::Impossible);
 <span class="kw">const </span>NOT_ENOUGH: ParseError = ParseError(ParseErrorKind::NotEnough);
 <span class="kw">const </span>INVALID: ParseError = ParseError(ParseErrorKind::Invalid);
 <span class="kw">const </span>TOO_SHORT: ParseError = ParseError(ParseErrorKind::TooShort);
 <span class="kw">const </span>TOO_LONG: ParseError = ParseError(ParseErrorKind::TooLong);
 <span class="kw">const </span>BAD_FORMAT: ParseError = ParseError(ParseErrorKind::BadFormat);

 <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">struct </span>Locales {
     short_months: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>[<span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str],
     long_months: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>[<span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str],
     short_weekdays: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>[<span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str],
     long_weekdays: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>[<span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str],
     am_pm: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>[<span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str],
 }

 <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">impl </span>Locales {
     <span class="kw">fn </span>new(_locale: <span class="prelude-ty">Option</span>&lt;Locale&gt;) -&gt; <span class="self">Self </span>{
         <span class="attribute">#[cfg(feature = <span class="string">&quot;unstable-locales&quot;</span>)]
         </span>{
             <span class="kw">let </span>locale = _locale.unwrap_or(Locale::POSIX);
             <span class="self">Self </span>{
                 short_months: locales::short_months(locale),
                 long_months: locales::long_months(locale),
                 short_weekdays: locales::short_weekdays(locale),
                 long_weekdays: locales::long_weekdays(locale),
                 am_pm: locales::am_pm(locale),
             }
         }
         <span class="attribute">#[cfg(not(feature = <span class="string">&quot;unstable-locales&quot;</span>))]
         </span><span class="self">Self </span>{
             short_months: <span class="kw-2">&amp;</span>[
                 <span class="string">&quot;Jan&quot;</span>, <span class="string">&quot;Feb&quot;</span>, <span class="string">&quot;Mar&quot;</span>, <span class="string">&quot;Apr&quot;</span>, <span class="string">&quot;May&quot;</span>, <span class="string">&quot;Jun&quot;</span>, <span class="string">&quot;Jul&quot;</span>, <span class="string">&quot;Aug&quot;</span>, <span class="string">&quot;Sep&quot;</span>, <span class="string">&quot;Oct&quot;</span>, <span class="string">&quot;Nov&quot;</span>, <span class="string">&quot;Dec&quot;</span>,
             ],
             long_months: <span class="kw-2">&amp;</span>[
                 <span class="string">&quot;January&quot;</span>,
                 <span class="string">&quot;February&quot;</span>,
                 <span class="string">&quot;March&quot;</span>,
                 <span class="string">&quot;April&quot;</span>,
                 <span class="string">&quot;May&quot;</span>,
                 <span class="string">&quot;June&quot;</span>,
                 <span class="string">&quot;July&quot;</span>,
                 <span class="string">&quot;August&quot;</span>,
                 <span class="string">&quot;September&quot;</span>,
                 <span class="string">&quot;October&quot;</span>,
                 <span class="string">&quot;November&quot;</span>,
                 <span class="string">&quot;December&quot;</span>,
             ],
             short_weekdays: <span class="kw-2">&amp;</span>[<span class="string">&quot;Sun&quot;</span>, <span class="string">&quot;Mon&quot;</span>, <span class="string">&quot;Tue&quot;</span>, <span class="string">&quot;Wed&quot;</span>, <span class="string">&quot;Thu&quot;</span>, <span class="string">&quot;Fri&quot;</span>, <span class="string">&quot;Sat&quot;</span>],
             long_weekdays: <span class="kw-2">&amp;</span>[
                 <span class="string">&quot;Sunday&quot;</span>,
                 <span class="string">&quot;Monday&quot;</span>,
                 <span class="string">&quot;Tuesday&quot;</span>,
                 <span class="string">&quot;Wednesday&quot;</span>,
                 <span class="string">&quot;Thursday&quot;</span>,
                 <span class="string">&quot;Friday&quot;</span>,
                 <span class="string">&quot;Saturday&quot;</span>,
             ],
             am_pm: <span class="kw-2">&amp;</span>[<span class="string">&quot;AM&quot;</span>, <span class="string">&quot;PM&quot;</span>],
         }
     }
 }

 <span class="doccomment">/// Formats single formatting item
 </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>))))]
 </span><span class="kw">pub fn </span>format_item(
     w: <span class="kw-2">&amp;mut </span>fmt::Formatter,
     date: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>NaiveDate&gt;,
     time: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>NaiveTime&gt;,
     off: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>(String, FixedOffset)&gt;,
     item: <span class="kw-2">&amp;</span>Item&lt;<span class="lifetime">&#39;_</span>&gt;,
 ) -&gt; fmt::Result {
     <span class="kw">let </span><span class="kw-2">mut </span>result = String::new();
     format_inner(<span class="kw-2">&amp;mut </span>result, date, time, off, item, <span class="prelude-val">None</span>)<span class="question-mark">?</span>;
     w.pad(<span class="kw-2">&amp;</span>result)
 }

 <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">fn </span>format_inner(
     result: <span class="kw-2">&amp;mut </span>String,
     date: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>NaiveDate&gt;,
     time: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>NaiveTime&gt;,
     off: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>(String, FixedOffset)&gt;,
     item: <span class="kw-2">&amp;</span>Item&lt;<span class="lifetime">&#39;_</span>&gt;,
     locale: <span class="prelude-ty">Option</span>&lt;Locale&gt;,
 ) -&gt; fmt::Result {
     <span class="kw">let </span>locale = Locales::new(locale);

     <span class="kw">match </span><span class="kw-2">*</span>item {
         Item::Literal(s) | Item::Space(s) =&gt; result.push_str(s),
         <span class="attribute">#[cfg(any(feature = <span class="string">&quot;alloc&quot;</span>, feature = <span class="string">&quot;std&quot;</span>, test))]
         </span>Item::OwnedLiteral(<span class="kw-2">ref </span>s) | Item::OwnedSpace(<span class="kw-2">ref </span>s) =&gt; result.push_str(s),

         Item::Numeric(<span class="kw-2">ref </span>spec, <span class="kw-2">ref </span>pad) =&gt; {
             <span class="kw">use </span><span class="self">self</span>::Numeric::<span class="kw-2">*</span>;

             <span class="kw">let </span>week_from_sun = |d: <span class="kw-2">&amp;</span>NaiveDate| d.weeks_from(Weekday::Sun);
             <span class="kw">let </span>week_from_mon = |d: <span class="kw-2">&amp;</span>NaiveDate| d.weeks_from(Weekday::Mon);

             <span class="kw">let </span>(width, v) = <span class="kw">match </span><span class="kw-2">*</span>spec {
                 Year =&gt; (<span class="number">4</span>, date.map(|d| i64::from(d.year()))),
                 YearDiv100 =&gt; (<span class="number">2</span>, date.map(|d| i64::from(d.year()).div_euclid(<span class="number">100</span>))),
                 YearMod100 =&gt; (<span class="number">2</span>, date.map(|d| i64::from(d.year()).rem_euclid(<span class="number">100</span>))),
                 IsoYear =&gt; (<span class="number">4</span>, date.map(|d| i64::from(d.iso_week().year()))),
                 IsoYearDiv100 =&gt; (<span class="number">2</span>, date.map(|d| i64::from(d.iso_week().year()).div_euclid(<span class="number">100</span>))),
                 IsoYearMod100 =&gt; (<span class="number">2</span>, date.map(|d| i64::from(d.iso_week().year()).rem_euclid(<span class="number">100</span>))),
                 Month =&gt; (<span class="number">2</span>, date.map(|d| i64::from(d.month()))),
                 Day =&gt; (<span class="number">2</span>, date.map(|d| i64::from(d.day()))),
                 WeekFromSun =&gt; (<span class="number">2</span>, date.map(|d| i64::from(week_from_sun(d)))),
                 WeekFromMon =&gt; (<span class="number">2</span>, date.map(|d| i64::from(week_from_mon(d)))),
                 IsoWeek =&gt; (<span class="number">2</span>, date.map(|d| i64::from(d.iso_week().week()))),
                 NumDaysFromSun =&gt; (<span class="number">1</span>, date.map(|d| i64::from(d.weekday().num_days_from_sunday()))),
                 WeekdayFromMon =&gt; (<span class="number">1</span>, date.map(|d| i64::from(d.weekday().number_from_monday()))),
                 Ordinal =&gt; (<span class="number">3</span>, date.map(|d| i64::from(d.ordinal()))),
                 Hour =&gt; (<span class="number">2</span>, time.map(|t| i64::from(t.hour()))),
                 Hour12 =&gt; (<span class="number">2</span>, time.map(|t| i64::from(t.hour12().<span class="number">1</span>))),
                 Minute =&gt; (<span class="number">2</span>, time.map(|t| i64::from(t.minute()))),
                 Second =&gt; (<span class="number">2</span>, time.map(|t| i64::from(t.second() + t.nanosecond() / <span class="number">1_000_000_000</span>))),
                 Nanosecond =&gt; (<span class="number">9</span>, time.map(|t| i64::from(t.nanosecond() % <span class="number">1_000_000_000</span>))),
                 Timestamp =&gt; (
                     <span class="number">1</span>,
                     <span class="kw">match </span>(date, time, off) {
                         (<span class="prelude-val">Some</span>(d), <span class="prelude-val">Some</span>(t), <span class="prelude-val">None</span>) =&gt; <span class="prelude-val">Some</span>(d.and_time(<span class="kw-2">*</span>t).timestamp()),
                         (<span class="prelude-val">Some</span>(d), <span class="prelude-val">Some</span>(t), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>(<span class="kw">_</span>, off))) =&gt; {
                             <span class="prelude-val">Some</span>((d.and_time(<span class="kw-2">*</span>t) - off).timestamp())
                         }
                         (<span class="kw">_</span>, <span class="kw">_</span>, <span class="kw">_</span>) =&gt; <span class="prelude-val">None</span>,
                     },
                 ),

                 <span class="comment">// for the future expansion
                 </span>Internal(<span class="kw-2">ref </span>int) =&gt; <span class="kw">match </span>int._dummy {},
             };

             <span class="kw">if let </span><span class="prelude-val">Some</span>(v) = v {
                 <span class="kw">if </span>(spec == <span class="kw-2">&amp;</span>Year || spec == <span class="kw-2">&amp;</span>IsoYear) &amp;&amp; !(<span class="number">0</span>..<span class="number">10_000</span>).contains(<span class="kw-2">&amp;</span>v) {
                     <span class="comment">// non-four-digit years require an explicit sign as per ISO 8601
                     </span><span class="kw">match </span><span class="kw-2">*</span>pad {
                         Pad::None =&gt; <span class="macro">write!</span>(result, <span class="string">&quot;{:+}&quot;</span>, v),
                         Pad::Zero =&gt; <span class="macro">write!</span>(result, <span class="string">&quot;{:+01$}&quot;</span>, v, width + <span class="number">1</span>),
                         Pad::Space =&gt; <span class="macro">write!</span>(result, <span class="string">&quot;{:+1$}&quot;</span>, v, width + <span class="number">1</span>),
                     }
                 } <span class="kw">else </span>{
                     <span class="kw">match </span><span class="kw-2">*</span>pad {
                         Pad::None =&gt; <span class="macro">write!</span>(result, <span class="string">&quot;{}&quot;</span>, v),
                         Pad::Zero =&gt; <span class="macro">write!</span>(result, <span class="string">&quot;{:01$}&quot;</span>, v, width),
                         Pad::Space =&gt; <span class="macro">write!</span>(result, <span class="string">&quot;{:1$}&quot;</span>, v, width),
                     }
                 }<span class="question-mark">?
             </span>} <span class="kw">else </span>{
                 <span class="kw">return </span><span class="prelude-val">Err</span>(fmt::Error); <span class="comment">// insufficient arguments for given format
             </span>}
         }

         Item::Fixed(<span class="kw-2">ref </span>spec) =&gt; {
             <span class="kw">use </span><span class="self">self</span>::Fixed::<span class="kw-2">*</span>;

             <span class="kw">let </span>ret =
                 <span class="kw">match </span><span class="kw-2">*</span>spec {
                     ShortMonthName =&gt; date.map(|d| {
                         result.push_str(locale.short_months[d.month0() <span class="kw">as </span>usize]);
                         <span class="prelude-val">Ok</span>(())
                     }),
                     LongMonthName =&gt; date.map(|d| {
                         result.push_str(locale.long_months[d.month0() <span class="kw">as </span>usize]);
                         <span class="prelude-val">Ok</span>(())
                     }),
                     ShortWeekdayName =&gt; date.map(|d| {
                         result.push_str(
                             locale.short_weekdays[d.weekday().num_days_from_sunday() <span class="kw">as </span>usize],
                         );
                         <span class="prelude-val">Ok</span>(())
                     }),
                     LongWeekdayName =&gt; date.map(|d| {
                         result.push_str(
                             locale.long_weekdays[d.weekday().num_days_from_sunday() <span class="kw">as </span>usize],
                         );
                         <span class="prelude-val">Ok</span>(())
                     }),
                     LowerAmPm =&gt; time.map(|t| {
                         <span class="kw">let </span>ampm = <span class="kw">if </span>t.hour12().<span class="number">0 </span>{ locale.am_pm[<span class="number">1</span>] } <span class="kw">else </span>{ locale.am_pm[<span class="number">0</span>] };
                         <span class="kw">for </span>char <span class="kw">in </span>ampm.chars() {
                             result.extend(char.to_lowercase())
                         }
                         <span class="prelude-val">Ok</span>(())
                     }),
                     UpperAmPm =&gt; time.map(|t| {
                         result.push_str(<span class="kw">if </span>t.hour12().<span class="number">0 </span>{
                             locale.am_pm[<span class="number">1</span>]
                         } <span class="kw">else </span>{
                             locale.am_pm[<span class="number">0</span>]
                         });
                         <span class="prelude-val">Ok</span>(())
                     }),
                     Nanosecond =&gt; time.map(|t| {
                         <span class="kw">let </span>nano = t.nanosecond() % <span class="number">1_000_000_000</span>;
                         <span class="kw">if </span>nano == <span class="number">0 </span>{
                             <span class="prelude-val">Ok</span>(())
                         } <span class="kw">else if </span>nano % <span class="number">1_000_000 </span>== <span class="number">0 </span>{
                             <span class="macro">write!</span>(result, <span class="string">&quot;.{:03}&quot;</span>, nano / <span class="number">1_000_000</span>)
                         } <span class="kw">else if </span>nano % <span class="number">1_000 </span>== <span class="number">0 </span>{
                             <span class="macro">write!</span>(result, <span class="string">&quot;.{:06}&quot;</span>, nano / <span class="number">1_000</span>)
                         } <span class="kw">else </span>{
                             <span class="macro">write!</span>(result, <span class="string">&quot;.{:09}&quot;</span>, nano)
                         }
                     }),
                     Nanosecond3 =&gt; time.map(|t| {
                         <span class="kw">let </span>nano = t.nanosecond() % <span class="number">1_000_000_000</span>;
                         <span class="macro">write!</span>(result, <span class="string">&quot;.{:03}&quot;</span>, nano / <span class="number">1_000_000</span>)
                     }),
                     Nanosecond6 =&gt; time.map(|t| {
                         <span class="kw">let </span>nano = t.nanosecond() % <span class="number">1_000_000_000</span>;
                         <span class="macro">write!</span>(result, <span class="string">&quot;.{:06}&quot;</span>, nano / <span class="number">1_000</span>)
                     }),
                     Nanosecond9 =&gt; time.map(|t| {
                         <span class="kw">let </span>nano = t.nanosecond() % <span class="number">1_000_000_000</span>;
                         <span class="macro">write!</span>(result, <span class="string">&quot;.{:09}&quot;</span>, nano)
                     }),
                     Internal(InternalFixed { val: InternalInternal::Nanosecond3NoDot }) =&gt; time
                         .map(|t| {
                             <span class="kw">let </span>nano = t.nanosecond() % <span class="number">1_000_000_000</span>;
                             <span class="macro">write!</span>(result, <span class="string">&quot;{:03}&quot;</span>, nano / <span class="number">1_000_000</span>)
                         }),
                     Internal(InternalFixed { val: InternalInternal::Nanosecond6NoDot }) =&gt; time
                         .map(|t| {
                             <span class="kw">let </span>nano = t.nanosecond() % <span class="number">1_000_000_000</span>;
                             <span class="macro">write!</span>(result, <span class="string">&quot;{:06}&quot;</span>, nano / <span class="number">1_000</span>)
                         }),
                     Internal(InternalFixed { val: InternalInternal::Nanosecond9NoDot }) =&gt; time
                         .map(|t| {
                             <span class="kw">let </span>nano = t.nanosecond() % <span class="number">1_000_000_000</span>;
                             <span class="macro">write!</span>(result, <span class="string">&quot;{:09}&quot;</span>, nano)
                         }),
                     TimezoneName =&gt; off.map(|(name, <span class="kw">_</span>)| {
                         result.push_str(name);
                         <span class="prelude-val">Ok</span>(())
                     }),
                     TimezoneOffsetColon =&gt; off
                         .map(|<span class="kw-2">&amp;</span>(<span class="kw">_</span>, off)| write_local_minus_utc(result, off, <span class="bool-val">false</span>, Colons::Single)),
                     TimezoneOffsetDoubleColon =&gt; off
                         .map(|<span class="kw-2">&amp;</span>(<span class="kw">_</span>, off)| write_local_minus_utc(result, off, <span class="bool-val">false</span>, Colons::Double)),
                     TimezoneOffsetTripleColon =&gt; off
                         .map(|<span class="kw-2">&amp;</span>(<span class="kw">_</span>, off)| write_local_minus_utc(result, off, <span class="bool-val">false</span>, Colons::Triple)),
                     TimezoneOffsetColonZ =&gt; off
                         .map(|<span class="kw-2">&amp;</span>(<span class="kw">_</span>, off)| write_local_minus_utc(result, off, <span class="bool-val">true</span>, Colons::Single)),
                     TimezoneOffset =&gt; {
                         off.map(|<span class="kw-2">&amp;</span>(<span class="kw">_</span>, off)| write_local_minus_utc(result, off, <span class="bool-val">false</span>, Colons::None))
                     }
                     TimezoneOffsetZ =&gt; {
                         off.map(|<span class="kw-2">&amp;</span>(<span class="kw">_</span>, off)| write_local_minus_utc(result, off, <span class="bool-val">true</span>, Colons::None))
                     }
                     Internal(InternalFixed { val: InternalInternal::TimezoneOffsetPermissive }) =&gt; {
                         <span class="macro">panic!</span>(<span class="string">&quot;Do not try to write %#z it is undefined&quot;</span>)
                     }
                     RFC2822 =&gt;
                     <span class="comment">// same as `%a, %d %b %Y %H:%M:%S %z`
                     </span>{
                         <span class="kw">if let </span>(<span class="prelude-val">Some</span>(d), <span class="prelude-val">Some</span>(t), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>(<span class="kw">_</span>, off))) = (date, time, off) {
                             <span class="prelude-val">Some</span>(write_rfc2822_inner(result, d, t, off, locale))
                         } <span class="kw">else </span>{
                             <span class="prelude-val">None
                         </span>}
                     }
                     RFC3339 =&gt;
                     <span class="comment">// same as `%Y-%m-%dT%H:%M:%S%.f%:z`
                     </span>{
                         <span class="kw">if let </span>(<span class="prelude-val">Some</span>(d), <span class="prelude-val">Some</span>(t), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>(<span class="kw">_</span>, off))) = (date, time, off) {
                             <span class="prelude-val">Some</span>(write_rfc3339(result, <span class="kw">crate</span>::NaiveDateTime::new(<span class="kw-2">*</span>d, <span class="kw-2">*</span>t), off))
                         } <span class="kw">else </span>{
                             <span class="prelude-val">None
                         </span>}
                     }
                 };

             <span class="kw">match </span>ret {
                 <span class="prelude-val">Some</span>(ret) =&gt; ret<span class="question-mark">?</span>,
                 <span class="prelude-val">None </span>=&gt; <span class="kw">return </span><span class="prelude-val">Err</span>(fmt::Error), <span class="comment">// insufficient arguments for given format
             </span>}
         }

         Item::Error =&gt; <span class="kw">return </span><span class="prelude-val">Err</span>(fmt::Error),
     }
     <span class="prelude-val">Ok</span>(())
 }

 <span class="doccomment">/// Prints an offset from UTC in the format of `+HHMM` or `+HH:MM`.
 /// `Z` instead of `+00[:]00` is allowed when `allow_zulu` is true.
 </span><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">fn </span>write_local_minus_utc(
     result: <span class="kw-2">&amp;mut </span>String,
     off: FixedOffset,
     allow_zulu: bool,
     colon_type: Colons,
 ) -&gt; fmt::Result {
     <span class="kw">let </span>off = off.local_minus_utc();
     <span class="kw">if </span>allow_zulu &amp;&amp; off == <span class="number">0 </span>{
         result.push(<span class="string">&#39;Z&#39;</span>);
         <span class="kw">return </span><span class="prelude-val">Ok</span>(());
     }
     <span class="kw">let </span>(sign, off) = <span class="kw">if </span>off &lt; <span class="number">0 </span>{ (<span class="string">&#39;-&#39;</span>, -off) } <span class="kw">else </span>{ (<span class="string">&#39;+&#39;</span>, off) };
     result.push(sign);

     write_hundreds(result, (off / <span class="number">3600</span>) <span class="kw">as </span>u8)<span class="question-mark">?</span>;

     <span class="kw">match </span>colon_type {
         Colons::None =&gt; write_hundreds(result, (off / <span class="number">60 </span>% <span class="number">60</span>) <span class="kw">as </span>u8),
         Colons::Single =&gt; {
             result.push(<span class="string">&#39;:&#39;</span>);
             write_hundreds(result, (off / <span class="number">60 </span>% <span class="number">60</span>) <span class="kw">as </span>u8)
         }
         Colons::Double =&gt; {
             result.push(<span class="string">&#39;:&#39;</span>);
             write_hundreds(result, (off / <span class="number">60 </span>% <span class="number">60</span>) <span class="kw">as </span>u8)<span class="question-mark">?</span>;
             result.push(<span class="string">&#39;:&#39;</span>);
             write_hundreds(result, (off % <span class="number">60</span>) <span class="kw">as </span>u8)
         }
         Colons::Triple =&gt; <span class="prelude-val">Ok</span>(()),
     }
 }

 <span class="doccomment">/// Writes the date, time and offset to the string. same as `%Y-%m-%dT%H:%M:%S%.f%:z`
 </span><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">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>write_rfc3339(
     result: <span class="kw-2">&amp;mut </span>String,
     dt: <span class="kw">crate</span>::NaiveDateTime,
     off: FixedOffset,
 ) -&gt; fmt::Result {
     <span class="comment">// reuse `Debug` impls which already print ISO 8601 format.
     // this is faster in this way.
     </span><span class="macro">write!</span>(result, <span class="string">&quot;{:?}&quot;</span>, dt)<span class="question-mark">?</span>;
     write_local_minus_utc(result, off, <span class="bool-val">false</span>, Colons::Single)
 }

 <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="doccomment">/// write datetimes like `Tue, 1 Jul 2003 10:52:37 +0200`, same as `%a, %d %b %Y %H:%M:%S %z`
 </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>write_rfc2822(
     result: <span class="kw-2">&amp;mut </span>String,
     dt: <span class="kw">crate</span>::NaiveDateTime,
     off: FixedOffset,
 ) -&gt; fmt::Result {
     write_rfc2822_inner(result, <span class="kw-2">&amp;</span>dt.date(), <span class="kw-2">&amp;</span>dt.time(), off, Locales::new(<span class="prelude-val">None</span>))
 }

 <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="doccomment">/// write datetimes like `Tue, 1 Jul 2003 10:52:37 +0200`, same as `%a, %d %b %Y %H:%M:%S %z`
 </span><span class="kw">fn </span>write_rfc2822_inner(
     result: <span class="kw-2">&amp;mut </span>String,
     d: <span class="kw-2">&amp;</span>NaiveDate,
     t: <span class="kw-2">&amp;</span>NaiveTime,
     off: FixedOffset,
     locale: Locales,
 ) -&gt; fmt::Result {
     <span class="kw">let </span>year = d.year();
     <span class="comment">// RFC2822 is only defined on years 0 through 9999
     </span><span class="kw">if </span>!(<span class="number">0</span>..=<span class="number">9999</span>).contains(<span class="kw-2">&amp;</span>year) {
         <span class="kw">return </span><span class="prelude-val">Err</span>(fmt::Error);
     }

     result.push_str(locale.short_weekdays[d.weekday().num_days_from_sunday() <span class="kw">as </span>usize]);
     result.push_str(<span class="string">&quot;, &quot;</span>);
     write_hundreds(result, d.day() <span class="kw">as </span>u8)<span class="question-mark">?</span>;
     result.push(<span class="string">&#39; &#39;</span>);
     result.push_str(locale.short_months[d.month0() <span class="kw">as </span>usize]);
     result.push(<span class="string">&#39; &#39;</span>);
     write_hundreds(result, (year / <span class="number">100</span>) <span class="kw">as </span>u8)<span class="question-mark">?</span>;
     write_hundreds(result, (year % <span class="number">100</span>) <span class="kw">as </span>u8)<span class="question-mark">?</span>;
     result.push(<span class="string">&#39; &#39;</span>);
     write_hundreds(result, t.hour() <span class="kw">as </span>u8)<span class="question-mark">?</span>;
     result.push(<span class="string">&#39;:&#39;</span>);
     write_hundreds(result, t.minute() <span class="kw">as </span>u8)<span class="question-mark">?</span>;
     result.push(<span class="string">&#39;:&#39;</span>);
     <span class="kw">let </span>sec = t.second() + t.nanosecond() / <span class="number">1_000_000_000</span>;
     write_hundreds(result, sec <span class="kw">as </span>u8)<span class="question-mark">?</span>;
     result.push(<span class="string">&#39; &#39;</span>);
     write_local_minus_utc(result, off, <span class="bool-val">false</span>, Colons::None)
 }

 <span class="doccomment">/// Equivalent to `{:02}` formatting for n &lt; 100.
 </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>write_hundreds(w: <span class="kw-2">&amp;mut </span><span class="kw">impl </span>Write, n: u8) -&gt; fmt::Result {
     <span class="kw">if </span>n &gt;= <span class="number">100 </span>{
         <span class="kw">return </span><span class="prelude-val">Err</span>(fmt::Error);
     }

     <span class="kw">let </span>tens = <span class="string">b&#39;0&#39; </span>+ n / <span class="number">10</span>;
     <span class="kw">let </span>ones = <span class="string">b&#39;0&#39; </span>+ n % <span class="number">10</span>;
     w.write_char(tens <span class="kw">as </span>char)<span class="question-mark">?</span>;
     w.write_char(ones <span class="kw">as </span>char)
 }

 <span class="doccomment">/// Tries to format given arguments with given formatting items.
 /// Internally used by `DelayedFormat`.
 </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>))))]
 </span><span class="kw">pub fn </span>format&lt;<span class="lifetime">&#39;a</span>, I, B&gt;(
     w: <span class="kw-2">&amp;mut </span>fmt::Formatter,
     date: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>NaiveDate&gt;,
     time: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>NaiveTime&gt;,
     off: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>(String, FixedOffset)&gt;,
     items: I,
 ) -&gt; fmt::Result
 <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><span class="kw-2">mut </span>result = String::new();
     <span class="kw">for </span>item <span class="kw">in </span>items {
         format_inner(<span class="kw-2">&amp;mut </span>result, date, time, off, item.borrow(), <span class="prelude-val">None</span>)<span class="question-mark">?</span>;
     }
     w.pad(<span class="kw-2">&amp;</span>result)
 }

 <span class="kw">mod </span>parsed;

 <span class="comment">// due to the size of parsing routines, they are in separate modules.
 </span><span class="kw">mod </span>parse;
 <span class="kw">mod </span>scan;

 <span class="kw">pub mod </span>strftime;

 <span class="doccomment">/// A *temporary* object which can be used as an argument to `format!` or others.
 /// This is normally constructed via `format` methods of each date and time type.
 </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>))))]
 #[derive(Debug)]
 </span><span class="kw">pub struct </span>DelayedFormat&lt;I&gt; {
     <span class="doccomment">/// The date view, if any.
     </span>date: <span class="prelude-ty">Option</span>&lt;NaiveDate&gt;,
     <span class="doccomment">/// The time view, if any.
     </span>time: <span class="prelude-ty">Option</span>&lt;NaiveTime&gt;,
     <span class="doccomment">/// The name and local-to-UTC difference for the offset (timezone), if any.
     </span>off: <span class="prelude-ty">Option</span>&lt;(String, FixedOffset)&gt;,
     <span class="doccomment">/// An iterator returning formatting items.
     </span>items: I,
     <span class="doccomment">/// Locale used for text.
     </span><span class="comment">// TODO: Only used with the locale feature. We should make this property
     // only present when the feature is enabled.
     </span><span class="attribute">#[cfg(feature = <span class="string">&quot;unstable-locales&quot;</span>)]
     </span>locale: <span class="prelude-ty">Option</span>&lt;Locale&gt;,
 }

 <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">impl</span>&lt;<span class="lifetime">&#39;a</span>, I: Iterator&lt;Item = B&gt; + Clone, B: Borrow&lt;Item&lt;<span class="lifetime">&#39;a</span>&gt;&gt;&gt; DelayedFormat&lt;I&gt; {
     <span class="doccomment">/// Makes a new `DelayedFormat` value out of local date and time.
     </span><span class="attribute">#[must_use]
     </span><span class="kw">pub fn </span>new(date: <span class="prelude-ty">Option</span>&lt;NaiveDate&gt;, time: <span class="prelude-ty">Option</span>&lt;NaiveTime&gt;, items: I) -&gt; DelayedFormat&lt;I&gt; {
         DelayedFormat {
             date,
             time,
             off: <span class="prelude-val">None</span>,
             items,
             <span class="attribute">#[cfg(feature = <span class="string">&quot;unstable-locales&quot;</span>)]
             </span>locale: <span class="prelude-val">None</span>,
         }
     }

     <span class="doccomment">/// Makes a new `DelayedFormat` value out of local date and time and UTC offset.
     </span><span class="attribute">#[must_use]
     </span><span class="kw">pub fn </span>new_with_offset&lt;Off&gt;(
         date: <span class="prelude-ty">Option</span>&lt;NaiveDate&gt;,
         time: <span class="prelude-ty">Option</span>&lt;NaiveTime&gt;,
         offset: <span class="kw-2">&amp;</span>Off,
         items: I,
     ) -&gt; DelayedFormat&lt;I&gt;
     <span class="kw">where
         </span>Off: Offset + fmt::Display,
     {
         <span class="kw">let </span>name_and_diff = (offset.to_string(), offset.fix());
         DelayedFormat {
             date,
             time,
             off: <span class="prelude-val">Some</span>(name_and_diff),
             items,
             <span class="attribute">#[cfg(feature = <span class="string">&quot;unstable-locales&quot;</span>)]
             </span>locale: <span class="prelude-val">None</span>,
         }
     }

     <span class="doccomment">/// Makes a new `DelayedFormat` value out of local date and time 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>)))]
     #[must_use]
     </span><span class="kw">pub fn </span>new_with_locale(
         date: <span class="prelude-ty">Option</span>&lt;NaiveDate&gt;,
         time: <span class="prelude-ty">Option</span>&lt;NaiveTime&gt;,
         items: I,
         locale: Locale,
     ) -&gt; DelayedFormat&lt;I&gt; {
         DelayedFormat { date, time, off: <span class="prelude-val">None</span>, items, locale: <span class="prelude-val">Some</span>(locale) }
     }

     <span class="doccomment">/// Makes a new `DelayedFormat` value out of local date and time, UTC offset 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>)))]
     #[must_use]
     </span><span class="kw">pub fn </span>new_with_offset_and_locale&lt;Off&gt;(
         date: <span class="prelude-ty">Option</span>&lt;NaiveDate&gt;,
         time: <span class="prelude-ty">Option</span>&lt;NaiveTime&gt;,
         offset: <span class="kw-2">&amp;</span>Off,
         items: I,
         locale: Locale,
     ) -&gt; DelayedFormat&lt;I&gt;
     <span class="kw">where
         </span>Off: Offset + fmt::Display,
     {
         <span class="kw">let </span>name_and_diff = (offset.to_string(), offset.fix());
         DelayedFormat { date, time, off: <span class="prelude-val">Some</span>(name_and_diff), items, locale: <span class="prelude-val">Some</span>(locale) }
     }
 }

 <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">impl</span>&lt;<span class="lifetime">&#39;a</span>, I: Iterator&lt;Item = B&gt; + Clone, B: Borrow&lt;Item&lt;<span class="lifetime">&#39;a</span>&gt;&gt;&gt; fmt::Display <span class="kw">for </span>DelayedFormat&lt;I&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="attribute">#[cfg(feature = <span class="string">&quot;unstable-locales&quot;</span>)]
         </span>{
             <span class="kw">if let </span><span class="prelude-val">Some</span>(locale) = <span class="self">self</span>.locale {
                 <span class="kw">return </span>format_localized(
                     f,
                     <span class="self">self</span>.date.as_ref(),
                     <span class="self">self</span>.time.as_ref(),
                     <span class="self">self</span>.off.as_ref(),
                     <span class="self">self</span>.items.clone(),
                     locale,
                 );
             }
         }

         format(f, <span class="self">self</span>.date.as_ref(), <span class="self">self</span>.time.as_ref(), <span class="self">self</span>.off.as_ref(), <span class="self">self</span>.items.clone())
     }
 }

 <span class="comment">// this implementation is here only because we need some private code from `scan`

 </span><span class="doccomment">/// Parsing a `str` into a `Weekday` uses the format [`%W`](./format/strftime/index.html).
 ///
 /// # Example
 ///
 /// ```
 /// use chrono::Weekday;
 ///
 /// assert_eq!(&quot;Sunday&quot;.parse::&lt;Weekday&gt;(), Ok(Weekday::Sun));
 /// assert!(&quot;any day&quot;.parse::&lt;Weekday&gt;().is_err());
 /// ```
 ///
 /// The parsing is case-insensitive.
 ///
 /// ```
 /// # use chrono::Weekday;
 /// assert_eq!(&quot;mON&quot;.parse::&lt;Weekday&gt;(), Ok(Weekday::Mon));
 /// ```
 ///
 /// Only the shortest form (e.g. `sun`) and the longest form (e.g. `sunday`) is accepted.
 ///
 /// ```
 /// # use chrono::Weekday;
 /// assert!(&quot;thurs&quot;.parse::&lt;Weekday&gt;().is_err());
 /// ```
 </span><span class="kw">impl </span>FromStr <span class="kw">for </span>Weekday {
     <span class="kw">type </span><span class="prelude-val">Err </span>= ParseWeekdayError;

     <span class="kw">fn </span>from_str(s: <span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, <span class="self">Self</span>::Err&gt; {
         <span class="kw">if let </span><span class="prelude-val">Ok</span>((<span class="string">&quot;&quot;</span>, w)) = scan::short_or_long_weekday(s) {
             <span class="prelude-val">Ok</span>(w)
         } <span class="kw">else </span>{
             <span class="prelude-val">Err</span>(ParseWeekdayError { _dummy: () })
         }
     }
 }

 <span class="doccomment">/// Formats single formatting item
 </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>)))]
 </span><span class="kw">pub fn </span>format_item_localized&lt;<span class="lifetime">&#39;a</span>&gt;(
     w: <span class="kw-2">&amp;mut </span>fmt::Formatter,
     date: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>NaiveDate&gt;,
     time: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>NaiveTime&gt;,
     off: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>(String, FixedOffset)&gt;,
     item: <span class="kw-2">&amp;</span>Item&lt;<span class="lifetime">&#39;a</span>&gt;,
     locale: Locale,
 ) -&gt; fmt::Result {
     <span class="kw">let </span><span class="kw-2">mut </span>result = String::new();
     format_inner(<span class="kw-2">&amp;mut </span>result, date, time, off, item, <span class="prelude-val">Some</span>(locale))<span class="question-mark">?</span>;
     w.pad(<span class="kw-2">&amp;</span>result)
 }

 <span class="doccomment">/// Tries to format given arguments with given formatting items.
 /// Internally used by `DelayedFormat`.
 </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>)))]
 </span><span class="kw">pub fn </span>format_localized&lt;<span class="lifetime">&#39;a</span>, I, B&gt;(
     w: <span class="kw-2">&amp;mut </span>fmt::Formatter,
     date: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>NaiveDate&gt;,
     time: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>NaiveTime&gt;,
     off: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>(String, FixedOffset)&gt;,
     items: I,
     locale: Locale,
 ) -&gt; fmt::Result
 <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><span class="kw-2">mut </span>result = String::new();
     <span class="kw">for </span>item <span class="kw">in </span>items {
         format_inner(<span class="kw-2">&amp;mut </span>result, date, time, off, item.borrow(), <span class="prelude-val">Some</span>(locale))<span class="question-mark">?</span>;
     }
     w.pad(<span class="kw-2">&amp;</span>result)
 }

 <span class="doccomment">/// Parsing a `str` into a `Month` uses the format [`%W`](./format/strftime/index.html).
 ///
 /// # Example
 ///
 /// ```
 /// use chrono::Month;
 ///
 /// assert_eq!(&quot;January&quot;.parse::&lt;Month&gt;(), Ok(Month::January));
 /// assert!(&quot;any day&quot;.parse::&lt;Month&gt;().is_err());
 /// ```
 ///
 /// The parsing is case-insensitive.
 ///
 /// ```
 /// # use chrono::Month;
 /// assert_eq!(&quot;fEbruARy&quot;.parse::&lt;Month&gt;(), Ok(Month::February));
 /// ```
 ///
 /// Only the shortest form (e.g. `jan`) and the longest form (e.g. `january`) is accepted.
 ///
 /// ```
 /// # use chrono::Month;
 /// assert!(&quot;septem&quot;.parse::&lt;Month&gt;().is_err());
 /// assert!(&quot;Augustin&quot;.parse::&lt;Month&gt;().is_err());
 /// ```
 </span><span class="kw">impl </span>FromStr <span class="kw">for </span>Month {
     <span class="kw">type </span><span class="prelude-val">Err </span>= ParseMonthError;

     <span class="kw">fn </span>from_str(s: <span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, <span class="self">Self</span>::Err&gt; {
         <span class="kw">if let </span><span class="prelude-val">Ok</span>((<span class="string">&quot;&quot;</span>, w)) = scan::short_or_long_month0(s) {
             <span class="kw">match </span>w {
                 <span class="number">0 </span>=&gt; <span class="prelude-val">Ok</span>(Month::January),
                 <span class="number">1 </span>=&gt; <span class="prelude-val">Ok</span>(Month::February),
                 <span class="number">2 </span>=&gt; <span class="prelude-val">Ok</span>(Month::March),
                 <span class="number">3 </span>=&gt; <span class="prelude-val">Ok</span>(Month::April),
                 <span class="number">4 </span>=&gt; <span class="prelude-val">Ok</span>(Month::May),
                 <span class="number">5 </span>=&gt; <span class="prelude-val">Ok</span>(Month::June),
                 <span class="number">6 </span>=&gt; <span class="prelude-val">Ok</span>(Month::July),
                 <span class="number">7 </span>=&gt; <span class="prelude-val">Ok</span>(Month::August),
                 <span class="number">8 </span>=&gt; <span class="prelude-val">Ok</span>(Month::September),
                 <span class="number">9 </span>=&gt; <span class="prelude-val">Ok</span>(Month::October),
                 <span class="number">10 </span>=&gt; <span class="prelude-val">Ok</span>(Month::November),
                 <span class="number">11 </span>=&gt; <span class="prelude-val">Ok</span>(Month::December),
                 <span class="kw">_ </span>=&gt; <span class="prelude-val">Err</span>(ParseMonthError { _dummy: () }),
             }
         } <span class="kw">else </span>{
             <span class="prelude-val">Err</span>(ParseMonthError { _dummy: () })
         }
     }
 }
 </code></pre></div>
 </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="chrono" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html>