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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 time without timezone.

 </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">use </span>core::borrow::Borrow;
 <span class="kw">use </span>core::ops::{Add, AddAssign, Sub, SubAssign};
 <span class="kw">use </span>core::{fmt, str};

 <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(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="kw">use </span><span class="kw">crate</span>::format::{
     parse, parse_and_remainder, write_hundreds, Fixed, Item, Numeric, Pad, ParseError, ParseResult,
     Parsed, StrftimeItems,
 };
 <span class="kw">use </span><span class="kw">crate</span>::oldtime::Duration <span class="kw">as </span>OldDuration;
 <span class="kw">use </span><span class="kw">crate</span>::Timelike;

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

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

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

 <span class="doccomment">/// ISO 8601 time without timezone.
 /// Allows for the nanosecond precision and optional leap second representation.
 ///
 /// # Leap Second Handling
 ///
 /// Since 1960s, the manmade atomic clock has been so accurate that
 /// it is much more accurate than Earth&#39;s own motion.
 /// It became desirable to define the civil time in terms of the atomic clock,
 /// but that risks the desynchronization of the civil time from Earth.
 /// To account for this, the designers of the Coordinated Universal Time (UTC)
 /// made that the UTC should be kept within 0.9 seconds of the observed Earth-bound time.
 /// When the mean solar day is longer than the ideal (86,400 seconds),
 /// the error slowly accumulates and it is necessary to add a **leap second**
 /// to slow the UTC down a bit.
 /// (We may also remove a second to speed the UTC up a bit, but it never happened.)
 /// The leap second, if any, follows 23:59:59 of June 30 or December 31 in the UTC.
 ///
 /// Fast forward to the 21st century,
 /// we have seen 26 leap seconds from January 1972 to December 2015.
 /// Yes, 26 seconds. Probably you can read this paragraph within 26 seconds.
 /// But those 26 seconds, and possibly more in the future, are never predictable,
 /// and whether to add a leap second or not is known only before 6 months.
 /// Internet-based clocks (via NTP) do account for known leap seconds,
 /// but the system API normally doesn&#39;t (and often can&#39;t, with no network connection)
 /// and there is no reliable way to retrieve leap second information.
 ///
 /// Chrono does not try to accurately implement leap seconds; it is impossible.
 /// Rather, **it allows for leap seconds but behaves as if there are *no other* leap seconds.**
 /// Various operations will ignore any possible leap second(s)
 /// except when any of the operands were actually leap seconds.
 ///
 /// If you cannot tolerate this behavior,
 /// you must use a separate `TimeZone` for the International Atomic Time (TAI).
 /// TAI is like UTC but has no leap seconds, and thus slightly differs from UTC.
 /// Chrono does not yet provide such implementation, but it is planned.
 ///
 /// ## Representing Leap Seconds
 ///
 /// The leap second is indicated via fractional seconds more than 1 second.
 /// This makes possible to treat a leap second as the prior non-leap second
 /// if you don&#39;t care about sub-second accuracy.
 /// You should use the proper formatting to get the raw leap second.
 ///
 /// All methods accepting fractional seconds will accept such values.
 ///
 /// ```
 /// use chrono::{NaiveDate, NaiveTime, Utc};
 ///
 /// let t = NaiveTime::from_hms_milli_opt(8, 59, 59, 1_000).unwrap();
 ///
 /// let dt1 = NaiveDate::from_ymd_opt(2015, 7, 1).unwrap().and_hms_micro_opt(8, 59, 59, 1_000_000).unwrap();
 ///
 /// let dt2 = NaiveDate::from_ymd_opt(2015, 6, 30).unwrap().and_hms_nano_opt(23, 59, 59, 1_000_000_000).unwrap().and_local_timezone(Utc).unwrap();
 /// # let _ = (t, dt1, dt2);
 /// ```
 ///
 /// Note that the leap second can happen anytime given an appropriate time zone;
 /// 2015-07-01 01:23:60 would be a proper leap second if UTC+01:24 had existed.
 /// Practically speaking, though, by the time of the first leap second on 1972-06-30,
 /// every time zone offset around the world has standardized to the 5-minute alignment.
 ///
 /// ## Date And Time Arithmetics
 ///
 /// As a concrete example, let&#39;s assume that `03:00:60` and `04:00:60` are leap seconds.
 /// In reality, of course, leap seconds are separated by at least 6 months.
 /// We will also use some intuitive concise notations for the explanation.
 ///
 /// `Time + Duration`
 /// (short for [`NaiveTime::overflowing_add_signed`](#method.overflowing_add_signed)):
 ///
 /// - `03:00:00 + 1s = 03:00:01`.
 /// - `03:00:59 + 60s = 03:02:00`.
 /// - `03:00:59 + 1s = 03:01:00`.
 /// - `03:00:60 + 1s = 03:01:00`.
 ///   Note that the sum is identical to the previous.
 /// - `03:00:60 + 60s = 03:01:59`.
 /// - `03:00:60 + 61s = 03:02:00`.
 /// - `03:00:60.1 + 0.8s = 03:00:60.9`.
 ///
 /// `Time - Duration`
 /// (short for [`NaiveTime::overflowing_sub_signed`](#method.overflowing_sub_signed)):
 ///
 /// - `03:00:00 - 1s = 02:59:59`.
 /// - `03:01:00 - 1s = 03:00:59`.
 /// - `03:01:00 - 60s = 03:00:00`.
 /// - `03:00:60 - 60s = 03:00:00`.
 ///   Note that the result is identical to the previous.
 /// - `03:00:60.7 - 0.4s = 03:00:60.3`.
 /// - `03:00:60.7 - 0.9s = 03:00:59.8`.
 ///
 /// `Time - Time`
 /// (short for [`NaiveTime::signed_duration_since`](#method.signed_duration_since)):
 ///
 /// - `04:00:00 - 03:00:00 = 3600s`.
 /// - `03:01:00 - 03:00:00 = 60s`.
 /// - `03:00:60 - 03:00:00 = 60s`.
 ///   Note that the difference is identical to the previous.
 /// - `03:00:60.6 - 03:00:59.4 = 1.2s`.
 /// - `03:01:00 - 03:00:59.8 = 0.2s`.
 /// - `03:01:00 - 03:00:60.5 = 0.5s`.
 ///   Note that the difference is larger than the previous,
 ///   even though the leap second clearly follows the previous whole second.
 /// - `04:00:60.9 - 03:00:60.1 =
 ///   (04:00:60.9 - 04:00:00) + (04:00:00 - 03:01:00) + (03:01:00 - 03:00:60.1) =
 ///   60.9s + 3540s + 0.9s = 3601.8s`.
 ///
 /// In general,
 ///
 /// - `Time + Duration` unconditionally equals to `Duration + Time`.
 ///
 /// - `Time - Duration` unconditionally equals to `Time + (-Duration)`.
 ///
 /// - `Time1 - Time2` unconditionally equals to `-(Time2 - Time1)`.
 ///
 /// - Associativity does not generally hold, because
 ///   `(Time + Duration1) - Duration2` no longer equals to `Time + (Duration1 - Duration2)`
 ///   for two positive durations.
 ///
 ///     - As a special case, `(Time + Duration) - Duration` also does not equal to `Time`.
 ///
 ///     - If you can assume that all durations have the same sign, however,
 ///       then the associativity holds:
 ///       `(Time + Duration1) + Duration2` equals to `Time + (Duration1 + Duration2)`
 ///       for two positive durations.
 ///
 /// ## Reading And Writing Leap Seconds
 ///
 /// The &quot;typical&quot; leap seconds on the minute boundary are
 /// correctly handled both in the formatting and parsing.
 /// The leap second in the human-readable representation
 /// will be represented as the second part being 60, as required by ISO 8601.
 ///
 /// ```
 /// use chrono::{Utc, NaiveDate};
 ///
 /// let dt = NaiveDate::from_ymd_opt(2015, 6, 30).unwrap().and_hms_milli_opt(23, 59, 59, 1_000).unwrap().and_local_timezone(Utc).unwrap();
 /// assert_eq!(format!(&quot;{:?}&quot;, dt), &quot;2015-06-30T23:59:60Z&quot;);
 /// ```
 ///
 /// There are hypothetical leap seconds not on the minute boundary
 /// nevertheless supported by Chrono.
 /// They are allowed for the sake of completeness and consistency;
 /// there were several &quot;exotic&quot; time zone offsets with fractional minutes prior to UTC after all.
 /// For such cases the human-readable representation is ambiguous
 /// and would be read back to the next non-leap second.
 ///
 /// ```
 /// use chrono::{DateTime, Utc, TimeZone, NaiveDate};
 ///
 /// let dt = NaiveDate::from_ymd_opt(2015, 6, 30).unwrap().and_hms_milli_opt(23, 56, 4, 1_000).unwrap().and_local_timezone(Utc).unwrap();
 /// assert_eq!(format!(&quot;{:?}&quot;, dt), &quot;2015-06-30T23:56:05Z&quot;);
 ///
 /// let dt = Utc.with_ymd_and_hms(2015, 6, 30, 23, 56, 5).unwrap();
 /// assert_eq!(format!(&quot;{:?}&quot;, dt), &quot;2015-06-30T23:56:05Z&quot;);
 /// assert_eq!(DateTime::parse_from_rfc3339(&quot;2015-06-30T23:56:05Z&quot;).unwrap(), dt);
 /// ```
 ///
 /// Since Chrono alone cannot determine any existence of leap seconds,
 /// **there is absolutely no guarantee that the leap second read has actually happened**.
 </span><span class="attribute">#[derive(PartialEq, Eq, Hash, PartialOrd, Ord, Copy, Clone)]
 #[cfg_attr(feature = <span class="string">&quot;rkyv&quot;</span>, derive(Archive, Deserialize, Serialize))]
 </span><span class="kw">pub struct </span>NaiveTime {
     secs: u32,
     frac: u32,
 }

 <span class="attribute">#[cfg(feature = <span class="string">&quot;arbitrary&quot;</span>)]
 </span><span class="kw">impl </span>arbitrary::Arbitrary&lt;<span class="lifetime">&#39;_</span>&gt; <span class="kw">for </span>NaiveTime {
     <span class="kw">fn </span>arbitrary(u: <span class="kw-2">&amp;mut </span>arbitrary::Unstructured) -&gt; arbitrary::Result&lt;NaiveTime&gt; {
         <span class="kw">let </span>secs = u.int_in_range(<span class="number">0</span>..=<span class="number">86_399</span>)<span class="question-mark">?</span>;
         <span class="kw">let </span>nano = u.int_in_range(<span class="number">0</span>..=<span class="number">1_999_999_999</span>)<span class="question-mark">?</span>;
         <span class="kw">let </span>time = NaiveTime::from_num_seconds_from_midnight_opt(secs, nano)
             .expect(<span class="string">&quot;Could not generate a valid chrono::NaiveTime. It looks like implementation of Arbitrary for NaiveTime is erroneous.&quot;</span>);
         <span class="prelude-val">Ok</span>(time)
     }
 }

 <span class="kw">impl </span>NaiveTime {
     <span class="doccomment">/// Makes a new `NaiveTime` from hour, minute and second.
     ///
     /// No [leap second](#leap-second-handling) is allowed here;
     /// use `NaiveTime::from_hms_*` methods with a subsecond parameter instead.
     ///
     /// Panics on invalid hour, minute and/or second.
     </span><span class="attribute">#[deprecated(since = <span class="string">&quot;0.4.23&quot;</span>, note = <span class="string">&quot;use `from_hms_opt()` instead&quot;</span>)]
     #[inline]
     #[must_use]
     </span><span class="kw">pub fn </span>from_hms(hour: u32, min: u32, sec: u32) -&gt; NaiveTime {
         NaiveTime::from_hms_opt(hour, min, sec).expect(<span class="string">&quot;invalid time&quot;</span>)
     }

     <span class="doccomment">/// Makes a new `NaiveTime` from hour, minute and second.
     ///
     /// No [leap second](#leap-second-handling) is allowed here;
     /// use `NaiveTime::from_hms_*_opt` methods with a subsecond parameter instead.
     ///
     /// Returns `None` on invalid hour, minute and/or second.
     ///
     /// # Example
     ///
     /// ```
     /// use chrono::NaiveTime;
     ///
     /// let from_hms_opt = NaiveTime::from_hms_opt;
     ///
     /// assert!(from_hms_opt(0, 0, 0).is_some());
     /// assert!(from_hms_opt(23, 59, 59).is_some());
     /// assert!(from_hms_opt(24, 0, 0).is_none());
     /// assert!(from_hms_opt(23, 60, 0).is_none());
     /// assert!(from_hms_opt(23, 59, 60).is_none());
     /// ```
     </span><span class="attribute">#[inline]
     #[must_use]
     </span><span class="kw">pub const fn </span>from_hms_opt(hour: u32, min: u32, sec: u32) -&gt; <span class="prelude-ty">Option</span>&lt;NaiveTime&gt; {
         NaiveTime::from_hms_nano_opt(hour, min, sec, <span class="number">0</span>)
     }

     <span class="doccomment">/// Makes a new `NaiveTime` from hour, minute, second and millisecond.
     ///
     /// The millisecond part can exceed 1,000
     /// in order to represent the [leap second](#leap-second-handling).
     ///
     /// Panics on invalid hour, minute, second and/or millisecond.
     </span><span class="attribute">#[deprecated(since = <span class="string">&quot;0.4.23&quot;</span>, note = <span class="string">&quot;use `from_hms_milli_opt()` instead&quot;</span>)]
     #[inline]
     #[must_use]
     </span><span class="kw">pub fn </span>from_hms_milli(hour: u32, min: u32, sec: u32, milli: u32) -&gt; NaiveTime {
         NaiveTime::from_hms_milli_opt(hour, min, sec, milli).expect(<span class="string">&quot;invalid time&quot;</span>)
     }

     <span class="doccomment">/// Makes a new `NaiveTime` from hour, minute, second and millisecond.
     ///
     /// The millisecond part can exceed 1,000
     /// in order to represent the [leap second](#leap-second-handling).
     ///
     /// Returns `None` on invalid hour, minute, second and/or millisecond.
     ///
     /// # Example
     ///
     /// ```
     /// use chrono::NaiveTime;
     ///
     /// let from_hmsm_opt = NaiveTime::from_hms_milli_opt;
     ///
     /// assert!(from_hmsm_opt(0, 0, 0, 0).is_some());
     /// assert!(from_hmsm_opt(23, 59, 59, 999).is_some());
     /// assert!(from_hmsm_opt(23, 59, 59, 1_999).is_some()); // a leap second after 23:59:59
     /// assert!(from_hmsm_opt(24, 0, 0, 0).is_none());
     /// assert!(from_hmsm_opt(23, 60, 0, 0).is_none());
     /// assert!(from_hmsm_opt(23, 59, 60, 0).is_none());
     /// assert!(from_hmsm_opt(23, 59, 59, 2_000).is_none());
     /// ```
     </span><span class="attribute">#[inline]
     #[must_use]
     </span><span class="kw">pub fn </span>from_hms_milli_opt(hour: u32, min: u32, sec: u32, milli: u32) -&gt; <span class="prelude-ty">Option</span>&lt;NaiveTime&gt; {
         milli
             .checked_mul(<span class="number">1_000_000</span>)
             .and_then(|nano| NaiveTime::from_hms_nano_opt(hour, min, sec, nano))
     }

     <span class="doccomment">/// Makes a new `NaiveTime` from hour, minute, second and microsecond.
     ///
     /// The microsecond part can exceed 1,000,000
     /// in order to represent the [leap second](#leap-second-handling).
     ///
     /// Panics on invalid hour, minute, second and/or microsecond.
     </span><span class="attribute">#[deprecated(since = <span class="string">&quot;0.4.23&quot;</span>, note = <span class="string">&quot;use `from_hms_micro_opt()` instead&quot;</span>)]
     #[inline]
     #[must_use]
     </span><span class="kw">pub fn </span>from_hms_micro(hour: u32, min: u32, sec: u32, micro: u32) -&gt; NaiveTime {
         NaiveTime::from_hms_micro_opt(hour, min, sec, micro).expect(<span class="string">&quot;invalid time&quot;</span>)
     }

     <span class="doccomment">/// Makes a new `NaiveTime` from hour, minute, second and microsecond.
     ///
     /// The microsecond part can exceed 1,000,000
     /// in order to represent the [leap second](#leap-second-handling).
     ///
     /// Returns `None` on invalid hour, minute, second and/or microsecond.
     ///
     /// # Example
     ///
     /// ```
     /// use chrono::NaiveTime;
     ///
     /// let from_hmsu_opt = NaiveTime::from_hms_micro_opt;
     ///
     /// assert!(from_hmsu_opt(0, 0, 0, 0).is_some());
     /// assert!(from_hmsu_opt(23, 59, 59, 999_999).is_some());
     /// assert!(from_hmsu_opt(23, 59, 59, 1_999_999).is_some()); // a leap second after 23:59:59
     /// assert!(from_hmsu_opt(24, 0, 0, 0).is_none());
     /// assert!(from_hmsu_opt(23, 60, 0, 0).is_none());
     /// assert!(from_hmsu_opt(23, 59, 60, 0).is_none());
     /// assert!(from_hmsu_opt(23, 59, 59, 2_000_000).is_none());
     /// ```
     </span><span class="attribute">#[inline]
     #[must_use]
     </span><span class="kw">pub fn </span>from_hms_micro_opt(hour: u32, min: u32, sec: u32, micro: u32) -&gt; <span class="prelude-ty">Option</span>&lt;NaiveTime&gt; {
         micro.checked_mul(<span class="number">1_000</span>).and_then(|nano| NaiveTime::from_hms_nano_opt(hour, min, sec, nano))
     }

     <span class="doccomment">/// Makes a new `NaiveTime` from hour, minute, second and nanosecond.
     ///
     /// The nanosecond part can exceed 1,000,000,000
     /// in order to represent the [leap second](#leap-second-handling).
     ///
     /// Panics on invalid hour, minute, second and/or nanosecond.
     </span><span class="attribute">#[deprecated(since = <span class="string">&quot;0.4.23&quot;</span>, note = <span class="string">&quot;use `from_hms_nano_opt()` instead&quot;</span>)]
     #[inline]
     #[must_use]
     </span><span class="kw">pub fn </span>from_hms_nano(hour: u32, min: u32, sec: u32, nano: u32) -&gt; NaiveTime {
         NaiveTime::from_hms_nano_opt(hour, min, sec, nano).expect(<span class="string">&quot;invalid time&quot;</span>)
     }

     <span class="doccomment">/// Makes a new `NaiveTime` from hour, minute, second and nanosecond.
     ///
     /// The nanosecond part can exceed 1,000,000,000
     /// in order to represent the [leap second](#leap-second-handling).
     ///
     /// Returns `None` on invalid hour, minute, second and/or nanosecond.
     ///
     /// # Example
     ///
     /// ```
     /// use chrono::NaiveTime;
     ///
     /// let from_hmsn_opt = NaiveTime::from_hms_nano_opt;
     ///
     /// assert!(from_hmsn_opt(0, 0, 0, 0).is_some());
     /// assert!(from_hmsn_opt(23, 59, 59, 999_999_999).is_some());
     /// assert!(from_hmsn_opt(23, 59, 59, 1_999_999_999).is_some()); // a leap second after 23:59:59
     /// assert!(from_hmsn_opt(24, 0, 0, 0).is_none());
     /// assert!(from_hmsn_opt(23, 60, 0, 0).is_none());
     /// assert!(from_hmsn_opt(23, 59, 60, 0).is_none());
     /// assert!(from_hmsn_opt(23, 59, 59, 2_000_000_000).is_none());
     /// ```
     </span><span class="attribute">#[inline]
     #[must_use]
     </span><span class="kw">pub const fn </span>from_hms_nano_opt(hour: u32, min: u32, sec: u32, nano: u32) -&gt; <span class="prelude-ty">Option</span>&lt;NaiveTime&gt; {
         <span class="kw">if </span>hour &gt;= <span class="number">24 </span>|| min &gt;= <span class="number">60 </span>|| sec &gt;= <span class="number">60 </span>|| nano &gt;= <span class="number">2_000_000_000 </span>{
             <span class="kw">return </span><span class="prelude-val">None</span>;
         }
         <span class="kw">let </span>secs = hour * <span class="number">3600 </span>+ min * <span class="number">60 </span>+ sec;
         <span class="prelude-val">Some</span>(NaiveTime { secs, frac: nano })
     }

     <span class="doccomment">/// Makes a new `NaiveTime` from the number of seconds since midnight and nanosecond.
     ///
     /// The nanosecond part can exceed 1,000,000,000
     /// in order to represent the [leap second](#leap-second-handling).
     ///
     /// Panics on invalid number of seconds and/or nanosecond.
     </span><span class="attribute">#[deprecated(since = <span class="string">&quot;0.4.23&quot;</span>, note = <span class="string">&quot;use `from_num_seconds_from_midnight_opt()` instead&quot;</span>)]
     #[inline]
     #[must_use]
     </span><span class="kw">pub fn </span>from_num_seconds_from_midnight(secs: u32, nano: u32) -&gt; NaiveTime {
         NaiveTime::from_num_seconds_from_midnight_opt(secs, nano).expect(<span class="string">&quot;invalid time&quot;</span>)
     }

     <span class="doccomment">/// Makes a new `NaiveTime` from the number of seconds since midnight and nanosecond.
     ///
     /// The nanosecond part can exceed 1,000,000,000
     /// in order to represent the [leap second](#leap-second-handling).
     ///
     /// Returns `None` on invalid number of seconds and/or nanosecond.
     ///
     /// # Example
     ///
     /// ```
     /// use chrono::NaiveTime;
     ///
     /// let from_nsecs_opt = NaiveTime::from_num_seconds_from_midnight_opt;
     ///
     /// assert!(from_nsecs_opt(0, 0).is_some());
     /// assert!(from_nsecs_opt(86399, 999_999_999).is_some());
     /// assert!(from_nsecs_opt(86399, 1_999_999_999).is_some()); // a leap second after 23:59:59
     /// assert!(from_nsecs_opt(86_400, 0).is_none());
     /// assert!(from_nsecs_opt(86399, 2_000_000_000).is_none());
     /// ```
     </span><span class="attribute">#[inline]
     #[must_use]
     </span><span class="kw">pub const fn </span>from_num_seconds_from_midnight_opt(secs: u32, nano: u32) -&gt; <span class="prelude-ty">Option</span>&lt;NaiveTime&gt; {
         <span class="kw">if </span>secs &gt;= <span class="number">86_400 </span>|| nano &gt;= <span class="number">2_000_000_000 </span>{
             <span class="kw">return </span><span class="prelude-val">None</span>;
         }
         <span class="prelude-val">Some</span>(NaiveTime { secs, frac: nano })
     }

     <span class="doccomment">/// Parses a string with the specified format string and returns a new `NaiveTime`.
     /// See the [`format::strftime` module](../format/strftime/index.html)
     /// on the supported escape sequences.
     ///
     /// # Example
     ///
     /// ```
     /// use chrono::NaiveTime;
     ///
     /// let parse_from_str = NaiveTime::parse_from_str;
     ///
     /// assert_eq!(parse_from_str(&quot;23:56:04&quot;, &quot;%H:%M:%S&quot;),
     ///            Ok(NaiveTime::from_hms_opt(23, 56, 4).unwrap()));
     /// assert_eq!(parse_from_str(&quot;pm012345.6789&quot;, &quot;%p%I%M%S%.f&quot;),
     ///            Ok(NaiveTime::from_hms_micro_opt(13, 23, 45, 678_900).unwrap()));
     /// ```
     ///
     /// Date and offset is ignored for the purpose of parsing.
     ///
     /// ```
     /// # use chrono::NaiveTime;
     /// # let parse_from_str = NaiveTime::parse_from_str;
     /// assert_eq!(parse_from_str(&quot;2014-5-17T12:34:56+09:30&quot;, &quot;%Y-%m-%dT%H:%M:%S%z&quot;),
     ///            Ok(NaiveTime::from_hms_opt(12, 34, 56).unwrap()));
     /// ```
     ///
     /// [Leap seconds](#leap-second-handling) are correctly handled by
     /// treating any time of the form `hh:mm:60` as a leap second.
     /// (This equally applies to the formatting, so the round trip is possible.)
     ///
     /// ```
     /// # use chrono::NaiveTime;
     /// # let parse_from_str = NaiveTime::parse_from_str;
     /// assert_eq!(parse_from_str(&quot;08:59:60.123&quot;, &quot;%H:%M:%S%.f&quot;),
     ///            Ok(NaiveTime::from_hms_milli_opt(8, 59, 59, 1_123).unwrap()));
     /// ```
     ///
     /// Missing seconds are assumed to be zero,
     /// but out-of-bound times or insufficient fields are errors otherwise.
     ///
     /// ```
     /// # use chrono::NaiveTime;
     /// # let parse_from_str = NaiveTime::parse_from_str;
     /// assert_eq!(parse_from_str(&quot;7:15&quot;, &quot;%H:%M&quot;),
     ///            Ok(NaiveTime::from_hms_opt(7, 15, 0).unwrap()));
     ///
     /// assert!(parse_from_str(&quot;04m33s&quot;, &quot;%Mm%Ss&quot;).is_err());
     /// assert!(parse_from_str(&quot;12&quot;, &quot;%H&quot;).is_err());
     /// assert!(parse_from_str(&quot;17:60&quot;, &quot;%H:%M&quot;).is_err());
     /// assert!(parse_from_str(&quot;24:00:00&quot;, &quot;%H:%M:%S&quot;).is_err());
     /// ```
     ///
     /// All parsed fields should be consistent to each other, otherwise it&#39;s an error.
     /// Here `%H` is for 24-hour clocks, unlike `%I`,
     /// and thus can be independently determined without AM/PM.
     ///
     /// ```
     /// # use chrono::NaiveTime;
     /// # let parse_from_str = NaiveTime::parse_from_str;
     /// assert!(parse_from_str(&quot;13:07 AM&quot;, &quot;%H:%M %p&quot;).is_err());
     /// ```
     </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;NaiveTime&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_naive_time()
     }

     <span class="doccomment">/// Parses a string from a user-specified format into a new `NaiveTime` value, and a slice with
     /// the remaining portion of the string.
     /// See the [`format::strftime` module](../format/strftime/index.html)
     /// on the supported escape sequences.
     ///
     /// Similar to [`parse_from_str`](#method.parse_from_str).
     ///
     /// # Example
     ///
     /// ```rust
     /// # use chrono::{NaiveTime};
     /// let (time, remainder) = NaiveTime::parse_and_remainder(
     ///     &quot;3h4m33s trailing text&quot;, &quot;%-Hh%-Mm%-Ss&quot;).unwrap();
     /// assert_eq!(time, NaiveTime::from_hms_opt(3, 4, 33).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;(NaiveTime, <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_naive_time().map(|t| (t, remainder))
     }

     <span class="doccomment">/// Adds given `Duration` to the current time,
     /// and also returns the number of *seconds*
     /// in the integral number of days ignored from the addition.
     /// (We cannot return `Duration` because it is subject to overflow or underflow.)
     ///
     /// # Example
     ///
     /// ```
     /// use chrono::{Duration, NaiveTime};
     ///
     /// let from_hms = |h, m, s| { NaiveTime::from_hms_opt(h, m, s).unwrap() };
     ///
     /// assert_eq!(from_hms(3, 4, 5).overflowing_add_signed(Duration::hours(11)),
     ///            (from_hms(14, 4, 5), 0));
     /// assert_eq!(from_hms(3, 4, 5).overflowing_add_signed(Duration::hours(23)),
     ///            (from_hms(2, 4, 5), 86_400));
     /// assert_eq!(from_hms(3, 4, 5).overflowing_add_signed(Duration::hours(-7)),
     ///            (from_hms(20, 4, 5), -86_400));
     /// ```
     </span><span class="attribute">#[must_use]
     </span><span class="kw">pub fn </span>overflowing_add_signed(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="kw-2">mut </span>rhs: OldDuration) -&gt; (NaiveTime, i64) {
         <span class="kw">let </span><span class="kw-2">mut </span>secs = <span class="self">self</span>.secs;
         <span class="kw">let </span><span class="kw-2">mut </span>frac = <span class="self">self</span>.frac;

         <span class="comment">// check if `self` is a leap second and adding `rhs` would escape that leap second.
         // if it&#39;s the case, update `self` and `rhs` to involve no leap second;
         // otherwise the addition immediately finishes.
         </span><span class="kw">if </span>frac &gt;= <span class="number">1_000_000_000 </span>{
             <span class="kw">let </span>rfrac = <span class="number">2_000_000_000 </span>- frac;
             <span class="kw">if </span>rhs &gt;= OldDuration::nanoseconds(i64::from(rfrac)) {
                 rhs = rhs - OldDuration::nanoseconds(i64::from(rfrac));
                 secs += <span class="number">1</span>;
                 frac = <span class="number">0</span>;
             } <span class="kw">else if </span>rhs &lt; OldDuration::nanoseconds(-i64::from(frac)) {
                 rhs = rhs + OldDuration::nanoseconds(i64::from(frac));
                 frac = <span class="number">0</span>;
             } <span class="kw">else </span>{
                 frac = (i64::from(frac) + rhs.num_nanoseconds().unwrap()) <span class="kw">as </span>u32;
                 <span class="macro">debug_assert!</span>(frac &lt; <span class="number">2_000_000_000</span>);
                 <span class="kw">return </span>(NaiveTime { secs, frac }, <span class="number">0</span>);
             }
         }
         <span class="macro">debug_assert!</span>(secs &lt;= <span class="number">86_400</span>);
         <span class="macro">debug_assert!</span>(frac &lt; <span class="number">1_000_000_000</span>);

         <span class="kw">let </span>rhssecs = rhs.num_seconds();
         <span class="kw">let </span>rhsfrac = (rhs - OldDuration::seconds(rhssecs)).num_nanoseconds().unwrap();
         <span class="macro">debug_assert_eq!</span>(OldDuration::seconds(rhssecs) + OldDuration::nanoseconds(rhsfrac), rhs);
         <span class="kw">let </span>rhssecsinday = rhssecs % <span class="number">86_400</span>;
         <span class="kw">let </span><span class="kw-2">mut </span>morerhssecs = rhssecs - rhssecsinday;
         <span class="kw">let </span>rhssecs = rhssecsinday <span class="kw">as </span>i32;
         <span class="kw">let </span>rhsfrac = rhsfrac <span class="kw">as </span>i32;
         <span class="macro">debug_assert!</span>(-<span class="number">86_400 </span>&lt; rhssecs &amp;&amp; rhssecs &lt; <span class="number">86_400</span>);
         <span class="macro">debug_assert_eq!</span>(morerhssecs % <span class="number">86_400</span>, <span class="number">0</span>);
         <span class="macro">debug_assert!</span>(-<span class="number">1_000_000_000 </span>&lt; rhsfrac &amp;&amp; rhsfrac &lt; <span class="number">1_000_000_000</span>);

         <span class="kw">let </span><span class="kw-2">mut </span>secs = secs <span class="kw">as </span>i32 + rhssecs;
         <span class="kw">let </span><span class="kw-2">mut </span>frac = frac <span class="kw">as </span>i32 + rhsfrac;
         <span class="macro">debug_assert!</span>(-<span class="number">86_400 </span>&lt; secs &amp;&amp; secs &lt; <span class="number">2 </span>* <span class="number">86_400</span>);
         <span class="macro">debug_assert!</span>(-<span class="number">1_000_000_000 </span>&lt; frac &amp;&amp; frac &lt; <span class="number">2_000_000_000</span>);

         <span class="kw">if </span>frac &lt; <span class="number">0 </span>{
             frac += <span class="number">1_000_000_000</span>;
             secs -= <span class="number">1</span>;
         } <span class="kw">else if </span>frac &gt;= <span class="number">1_000_000_000 </span>{
             frac -= <span class="number">1_000_000_000</span>;
             secs += <span class="number">1</span>;
         }
         <span class="macro">debug_assert!</span>((-<span class="number">86_400</span>..<span class="number">2 </span>* <span class="number">86_400</span>).contains(<span class="kw-2">&amp;</span>secs));
         <span class="macro">debug_assert!</span>((<span class="number">0</span>..<span class="number">1_000_000_000</span>).contains(<span class="kw-2">&amp;</span>frac));

         <span class="kw">if </span>secs &lt; <span class="number">0 </span>{
             secs += <span class="number">86_400</span>;
             morerhssecs -= <span class="number">86_400</span>;
         } <span class="kw">else if </span>secs &gt;= <span class="number">86_400 </span>{
             secs -= <span class="number">86_400</span>;
             morerhssecs += <span class="number">86_400</span>;
         }
         <span class="macro">debug_assert!</span>((<span class="number">0</span>..<span class="number">86_400</span>).contains(<span class="kw-2">&amp;</span>secs));

         (NaiveTime { secs: secs <span class="kw">as </span>u32, frac: frac <span class="kw">as </span>u32 }, morerhssecs)
     }

     <span class="doccomment">/// Subtracts given `Duration` from the current time,
     /// and also returns the number of *seconds*
     /// in the integral number of days ignored from the subtraction.
     /// (We cannot return `Duration` because it is subject to overflow or underflow.)
     ///
     /// # Example
     ///
     /// ```
     /// use chrono::{Duration, NaiveTime};
     ///
     /// let from_hms = |h, m, s| { NaiveTime::from_hms_opt(h, m, s).unwrap() };
     ///
     /// assert_eq!(from_hms(3, 4, 5).overflowing_sub_signed(Duration::hours(2)),
     ///            (from_hms(1, 4, 5), 0));
     /// assert_eq!(from_hms(3, 4, 5).overflowing_sub_signed(Duration::hours(17)),
     ///            (from_hms(10, 4, 5), 86_400));
     /// assert_eq!(from_hms(3, 4, 5).overflowing_sub_signed(Duration::hours(-22)),
     ///            (from_hms(1, 4, 5), -86_400));
     /// ```
     </span><span class="attribute">#[inline]
     #[must_use]
     </span><span class="kw">pub fn </span>overflowing_sub_signed(<span class="kw-2">&amp;</span><span class="self">self</span>, rhs: OldDuration) -&gt; (NaiveTime, i64) {
         <span class="kw">let </span>(time, rhs) = <span class="self">self</span>.overflowing_add_signed(-rhs);
         (time, -rhs) <span class="comment">// safe to negate, rhs is within +/- (2^63 / 1000)
     </span>}

     <span class="doccomment">/// Subtracts another `NaiveTime` from the current time.
     /// Returns a `Duration` within +/- 1 day.
     /// This does not overflow or underflow at all.
     ///
     /// As a part of Chrono&#39;s [leap second handling](#leap-second-handling),
     /// the subtraction assumes that **there is no leap second ever**,
     /// except when any of the `NaiveTime`s themselves represents a leap second
     /// in which case the assumption becomes that
     /// **there are exactly one (or two) leap second(s) ever**.
     ///
     /// # Example
     ///
     /// ```
     /// use chrono::{Duration, NaiveTime};
     ///
     /// let from_hmsm = |h, m, s, milli| { NaiveTime::from_hms_milli_opt(h, m, s, milli).unwrap() };
     /// let since = NaiveTime::signed_duration_since;
     ///
     /// assert_eq!(since(from_hmsm(3, 5, 7, 900), from_hmsm(3, 5, 7, 900)),
     ///            Duration::zero());
     /// assert_eq!(since(from_hmsm(3, 5, 7, 900), from_hmsm(3, 5, 7, 875)),
     ///            Duration::milliseconds(25));
     /// assert_eq!(since(from_hmsm(3, 5, 7, 900), from_hmsm(3, 5, 6, 925)),
     ///            Duration::milliseconds(975));
     /// assert_eq!(since(from_hmsm(3, 5, 7, 900), from_hmsm(3, 5, 0, 900)),
     ///            Duration::seconds(7));
     /// assert_eq!(since(from_hmsm(3, 5, 7, 900), from_hmsm(3, 0, 7, 900)),
     ///            Duration::seconds(5 * 60));
     /// assert_eq!(since(from_hmsm(3, 5, 7, 900), from_hmsm(0, 5, 7, 900)),
     ///            Duration::seconds(3 * 3600));
     /// assert_eq!(since(from_hmsm(3, 5, 7, 900), from_hmsm(4, 5, 7, 900)),
     ///            Duration::seconds(-3600));
     /// assert_eq!(since(from_hmsm(3, 5, 7, 900), from_hmsm(2, 4, 6, 800)),
     ///            Duration::seconds(3600 + 60 + 1) + Duration::milliseconds(100));
     /// ```
     ///
     /// Leap seconds are handled, but the subtraction assumes that
     /// there were no other leap seconds happened.
     ///
     /// ```
     /// # use chrono::{Duration, NaiveTime};
     /// # let from_hmsm = |h, m, s, milli| { NaiveTime::from_hms_milli_opt(h, m, s, milli).unwrap() };
     /// # let since = NaiveTime::signed_duration_since;
     /// assert_eq!(since(from_hmsm(3, 0, 59, 1_000), from_hmsm(3, 0, 59, 0)),
     ///            Duration::seconds(1));
     /// assert_eq!(since(from_hmsm(3, 0, 59, 1_500), from_hmsm(3, 0, 59, 0)),
     ///            Duration::milliseconds(1500));
     /// assert_eq!(since(from_hmsm(3, 0, 59, 1_000), from_hmsm(3, 0, 0, 0)),
     ///            Duration::seconds(60));
     /// assert_eq!(since(from_hmsm(3, 0, 0, 0), from_hmsm(2, 59, 59, 1_000)),
     ///            Duration::seconds(1));
     /// assert_eq!(since(from_hmsm(3, 0, 59, 1_000), from_hmsm(2, 59, 59, 1_000)),
     ///            Duration::seconds(61));
     /// ```
     </span><span class="attribute">#[must_use]
     </span><span class="kw">pub fn </span>signed_duration_since(<span class="self">self</span>, rhs: NaiveTime) -&gt; OldDuration {
         <span class="comment">//     |    |    :leap|    |    |    |    |    |    |    :leap|    |
         //     |    |    :    |    |    |    |    |    |    |    :    |    |
         // ----+----+-----*---+----+----+----+----+----+----+-------*-+----+----
         //          |   `rhs` |                             |    `self`
         //          |======================================&gt;|       |
         //          |     |  `self.secs - rhs.secs`         |`self.frac`
         //          |====&gt;|   |                             |======&gt;|
         //      `rhs.frac`|========================================&gt;|
         //          |     |   |        `self - rhs`         |       |

         </span><span class="kw">use </span>core::cmp::Ordering;

         <span class="kw">let </span>secs = i64::from(<span class="self">self</span>.secs) - i64::from(rhs.secs);
         <span class="kw">let </span>frac = i64::from(<span class="self">self</span>.frac) - i64::from(rhs.frac);

         <span class="comment">// `secs` may contain a leap second yet to be counted
         </span><span class="kw">let </span>adjust = <span class="kw">match </span><span class="self">self</span>.secs.cmp(<span class="kw-2">&amp;</span>rhs.secs) {
             Ordering::Greater =&gt; i64::from(rhs.frac &gt;= <span class="number">1_000_000_000</span>),
             Ordering::Equal =&gt; <span class="number">0</span>,
             Ordering::Less =&gt; {
                 <span class="kw">if </span><span class="self">self</span>.frac &gt;= <span class="number">1_000_000_000 </span>{
                     -<span class="number">1
                 </span>} <span class="kw">else </span>{
                     <span class="number">0
                 </span>}
             }
         };

         OldDuration::seconds(secs + adjust) + OldDuration::nanoseconds(frac)
     }

     <span class="doccomment">/// Formats the time with the specified formatting items.
     /// Otherwise it is the same as the ordinary [`format`](#method.format) method.
     ///
     /// The `Iterator` of items should be `Clone`able,
     /// since the resulting `DelayedFormat` value may be formatted multiple times.
     ///
     /// # Example
     ///
     /// ```
     /// use chrono::NaiveTime;
     /// use chrono::format::strftime::StrftimeItems;
     ///
     /// let fmt = StrftimeItems::new(&quot;%H:%M:%S&quot;);
     /// let t = NaiveTime::from_hms_opt(23, 56, 4).unwrap();
     /// assert_eq!(t.format_with_items(fmt.clone()).to_string(), &quot;23:56:04&quot;);
     /// assert_eq!(t.format(&quot;%H:%M:%S&quot;).to_string(),             &quot;23:56:04&quot;);
     /// ```
     ///
     /// The resulting `DelayedFormat` can be formatted directly via the `Display` trait.
     ///
     /// ```
     /// # use chrono::NaiveTime;
     /// # use chrono::format::strftime::StrftimeItems;
     /// # let fmt = StrftimeItems::new(&quot;%H:%M:%S&quot;).clone();
     /// # let t = NaiveTime::from_hms_opt(23, 56, 4).unwrap();
     /// assert_eq!(format!(&quot;{}&quot;, t.format_with_items(fmt)), &quot;23:56:04&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_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;,
     {
         DelayedFormat::new(<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="kw-2">*</span><span class="self">self</span>), items)
     }

     <span class="doccomment">/// Formats the time with the specified format string.
     /// See the [`format::strftime` module](../format/strftime/index.html)
     /// on the supported escape sequences.
     ///
     /// This returns a `DelayedFormat`,
     /// which gets converted to a string only when actual formatting happens.
     /// You may use the `to_string` method to get a `String`,
     /// or just feed it into `print!` and other formatting macros.
     /// (In this way it avoids the redundant memory allocation.)
     ///
     /// A wrong format string does *not* issue an error immediately.
     /// Rather, converting or formatting the `DelayedFormat` fails.
     /// You are recommended to immediately use `DelayedFormat` for this reason.
     ///
     /// # Example
     ///
     /// ```
     /// use chrono::NaiveTime;
     ///
     /// let t = NaiveTime::from_hms_nano_opt(23, 56, 4, 12_345_678).unwrap();
     /// assert_eq!(t.format(&quot;%H:%M:%S&quot;).to_string(), &quot;23:56:04&quot;);
     /// assert_eq!(t.format(&quot;%H:%M:%S%.6f&quot;).to_string(), &quot;23:56:04.012345&quot;);
     /// assert_eq!(t.format(&quot;%-I:%M %p&quot;).to_string(), &quot;11:56 PM&quot;);
     /// ```
     ///
     /// The resulting `DelayedFormat` can be formatted directly via the `Display` trait.
     ///
     /// ```
     /// # use chrono::NaiveTime;
     /// # let t = NaiveTime::from_hms_nano_opt(23, 56, 4, 12_345_678).unwrap();
     /// assert_eq!(format!(&quot;{}&quot;, t.format(&quot;%H:%M:%S&quot;)), &quot;23:56:04&quot;);
     /// assert_eq!(format!(&quot;{}&quot;, t.format(&quot;%H:%M:%S%.6f&quot;)), &quot;23:56:04.012345&quot;);
     /// assert_eq!(format!(&quot;{}&quot;, t.format(&quot;%-I:%M %p&quot;)), &quot;11:56 PM&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">/// Returns a triple of the hour, minute and second numbers.
     </span><span class="kw">fn </span>hms(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; (u32, u32, u32) {
         <span class="kw">let </span>sec = <span class="self">self</span>.secs % <span class="number">60</span>;
         <span class="kw">let </span>mins = <span class="self">self</span>.secs / <span class="number">60</span>;
         <span class="kw">let </span>min = mins % <span class="number">60</span>;
         <span class="kw">let </span>hour = mins / <span class="number">60</span>;
         (hour, min, sec)
     }

     <span class="doccomment">/// The earliest possible `NaiveTime`
     </span><span class="kw">pub const </span>MIN: <span class="self">Self </span>= <span class="self">Self </span>{ secs: <span class="number">0</span>, frac: <span class="number">0 </span>};
     <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">const </span>MAX: <span class="self">Self </span>= <span class="self">Self </span>{ secs: <span class="number">23 </span>* <span class="number">3600 </span>+ <span class="number">59 </span>* <span class="number">60 </span>+ <span class="number">59</span>, frac: <span class="number">999_999_999 </span>};
 }

 <span class="kw">impl </span>Timelike <span class="kw">for </span>NaiveTime {
     <span class="doccomment">/// Returns the hour number from 0 to 23.
     ///
     /// # Example
     ///
     /// ```
     /// use chrono::{NaiveTime, Timelike};
     ///
     /// assert_eq!(NaiveTime::from_hms_opt(0, 0, 0).unwrap().hour(), 0);
     /// assert_eq!(NaiveTime::from_hms_nano_opt(23, 56, 4, 12_345_678).unwrap().hour(), 23);
     /// ```
     </span><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>.hms().<span class="number">0
     </span>}

     <span class="doccomment">/// Returns the minute number from 0 to 59.
     ///
     /// # Example
     ///
     /// ```
     /// use chrono::{NaiveTime, Timelike};
     ///
     /// assert_eq!(NaiveTime::from_hms_opt(0, 0, 0).unwrap().minute(), 0);
     /// assert_eq!(NaiveTime::from_hms_nano_opt(23, 56, 4, 12_345_678).unwrap().minute(), 56);
     /// ```
     </span><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>.hms().<span class="number">1
     </span>}

     <span class="doccomment">/// Returns the second number from 0 to 59.
     ///
     /// # Example
     ///
     /// ```
     /// use chrono::{NaiveTime, Timelike};
     ///
     /// assert_eq!(NaiveTime::from_hms_opt(0, 0, 0).unwrap().second(), 0);
     /// assert_eq!(NaiveTime::from_hms_nano_opt(23, 56, 4, 12_345_678).unwrap().second(), 4);
     /// ```
     ///
     /// This method never returns 60 even when it is a leap second.
     /// ([Why?](#leap-second-handling))
     /// Use the proper [formatting method](#method.format) to get a human-readable representation.
     ///
     </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;```&quot;</span>)]
     </span><span class="doccomment">/// # use chrono::{NaiveTime, Timelike};
     /// let leap = NaiveTime::from_hms_milli_opt(23, 59, 59, 1_000).unwrap();
     /// assert_eq!(leap.second(), 59);
     /// assert_eq!(leap.format(&quot;%H:%M:%S&quot;).to_string(), &quot;23:59:60&quot;);
     /// ```
     </span><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>.hms().<span class="number">2
     </span>}

     <span class="doccomment">/// Returns the number of nanoseconds since the whole non-leap second.
     /// The range from 1,000,000,000 to 1,999,999,999 represents
     /// the [leap second](#leap-second-handling).
     ///
     /// # Example
     ///
     /// ```
     /// use chrono::{NaiveTime, Timelike};
     ///
     /// assert_eq!(NaiveTime::from_hms_opt(0, 0, 0).unwrap().nanosecond(), 0);
     /// assert_eq!(NaiveTime::from_hms_nano_opt(23, 56, 4, 12_345_678).unwrap().nanosecond(), 12_345_678);
     /// ```
     ///
     /// Leap seconds may have seemingly out-of-range return values.
     /// You can reduce the range with `time.nanosecond() % 1_000_000_000`, or
     /// use the proper [formatting method](#method.format) to get a human-readable representation.
     ///
     </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;```&quot;</span>)]
     </span><span class="doccomment">/// # use chrono::{NaiveTime, Timelike};
     /// let leap = NaiveTime::from_hms_milli_opt(23, 59, 59, 1_000).unwrap();
     /// assert_eq!(leap.nanosecond(), 1_000_000_000);
     /// assert_eq!(leap.format(&quot;%H:%M:%S%.9f&quot;).to_string(), &quot;23:59:60.000000000&quot;);
     /// ```
     </span><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>.frac
     }

     <span class="doccomment">/// Makes a new `NaiveTime` with the hour number changed.
     ///
     /// Returns `None` when the resulting `NaiveTime` would be invalid.
     ///
     /// # Example
     ///
     /// ```
     /// use chrono::{NaiveTime, Timelike};
     ///
     /// let dt = NaiveTime::from_hms_nano_opt(23, 56, 4, 12_345_678).unwrap();
     /// assert_eq!(dt.with_hour(7), Some(NaiveTime::from_hms_nano_opt(7, 56, 4, 12_345_678).unwrap()));
     /// assert_eq!(dt.with_hour(24), None);
     /// ```
     </span><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;NaiveTime&gt; {
         <span class="kw">if </span>hour &gt;= <span class="number">24 </span>{
             <span class="kw">return </span><span class="prelude-val">None</span>;
         }
         <span class="kw">let </span>secs = hour * <span class="number">3600 </span>+ <span class="self">self</span>.secs % <span class="number">3600</span>;
         <span class="prelude-val">Some</span>(NaiveTime { secs, ..<span class="kw-2">*</span><span class="self">self </span>})
     }

     <span class="doccomment">/// Makes a new `NaiveTime` with the minute number changed.
     ///
     /// Returns `None` when the resulting `NaiveTime` would be invalid.
     ///
     /// # Example
     ///
     /// ```
     /// use chrono::{NaiveTime, Timelike};
     ///
     /// let dt = NaiveTime::from_hms_nano_opt(23, 56, 4, 12_345_678).unwrap();
     /// assert_eq!(dt.with_minute(45), Some(NaiveTime::from_hms_nano_opt(23, 45, 4, 12_345_678).unwrap()));
     /// assert_eq!(dt.with_minute(60), None);
     /// ```
     </span><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;NaiveTime&gt; {
         <span class="kw">if </span>min &gt;= <span class="number">60 </span>{
             <span class="kw">return </span><span class="prelude-val">None</span>;
         }
         <span class="kw">let </span>secs = <span class="self">self</span>.secs / <span class="number">3600 </span>* <span class="number">3600 </span>+ min * <span class="number">60 </span>+ <span class="self">self</span>.secs % <span class="number">60</span>;
         <span class="prelude-val">Some</span>(NaiveTime { secs, ..<span class="kw-2">*</span><span class="self">self </span>})
     }

     <span class="doccomment">/// Makes a new `NaiveTime` with the second number changed.
     ///
     /// Returns `None` when the resulting `NaiveTime` would be invalid.
     /// As with the [`second`](#method.second) method,
     /// the input range is restricted to 0 through 59.
     ///
     /// # Example
     ///
     /// ```
     /// use chrono::{NaiveTime, Timelike};
     ///
     /// let dt = NaiveTime::from_hms_nano_opt(23, 56, 4, 12_345_678).unwrap();
     /// assert_eq!(dt.with_second(17), Some(NaiveTime::from_hms_nano_opt(23, 56, 17, 12_345_678).unwrap()));
     /// assert_eq!(dt.with_second(60), None);
     /// ```
     </span><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;NaiveTime&gt; {
         <span class="kw">if </span>sec &gt;= <span class="number">60 </span>{
             <span class="kw">return </span><span class="prelude-val">None</span>;
         }
         <span class="kw">let </span>secs = <span class="self">self</span>.secs / <span class="number">60 </span>* <span class="number">60 </span>+ sec;
         <span class="prelude-val">Some</span>(NaiveTime { secs, ..<span class="kw-2">*</span><span class="self">self </span>})
     }

     <span class="doccomment">/// Makes a new `NaiveTime` with nanoseconds since the whole non-leap second changed.
     ///
     /// Returns `None` when the resulting `NaiveTime` would be invalid.
     /// As with the [`nanosecond`](#method.nanosecond) method,
     /// the input range can exceed 1,000,000,000 for leap seconds.
     ///
     /// # Example
     ///
     /// ```
     /// use chrono::{NaiveTime, Timelike};
     ///
     /// let dt = NaiveTime::from_hms_nano_opt(23, 56, 4, 12_345_678).unwrap();
     /// assert_eq!(dt.with_nanosecond(333_333_333),
     ///            Some(NaiveTime::from_hms_nano_opt(23, 56, 4, 333_333_333).unwrap()));
     /// assert_eq!(dt.with_nanosecond(2_000_000_000), None);
     /// ```
     ///
     /// Leap seconds can theoretically follow *any* whole second.
     /// The following would be a proper leap second at the time zone offset of UTC-00:03:57
     /// (there are several historical examples comparable to this &quot;non-sense&quot; offset),
     /// and therefore is allowed.
     ///
     /// ```
     /// # use chrono::{NaiveTime, Timelike};
     /// # let dt = NaiveTime::from_hms_nano_opt(23, 56, 4, 12_345_678).unwrap();
     /// assert_eq!(dt.with_nanosecond(1_333_333_333),
     ///            Some(NaiveTime::from_hms_nano_opt(23, 56, 4, 1_333_333_333).unwrap()));
     /// ```
     </span><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;NaiveTime&gt; {
         <span class="kw">if </span>nano &gt;= <span class="number">2_000_000_000 </span>{
             <span class="kw">return </span><span class="prelude-val">None</span>;
         }
         <span class="prelude-val">Some</span>(NaiveTime { frac: nano, ..<span class="kw-2">*</span><span class="self">self </span>})
     }

     <span class="doccomment">/// Returns the number of non-leap seconds past the last midnight.
     ///
     /// # Example
     ///
     /// ```
     /// use chrono::{NaiveTime, Timelike};
     ///
     /// assert_eq!(NaiveTime::from_hms_opt(1, 2, 3).unwrap().num_seconds_from_midnight(),
     ///            3723);
     /// assert_eq!(NaiveTime::from_hms_nano_opt(23, 56, 4, 12_345_678).unwrap().num_seconds_from_midnight(),
     ///            86164);
     /// assert_eq!(NaiveTime::from_hms_milli_opt(23, 59, 59, 1_000).unwrap().num_seconds_from_midnight(),
     ///            86399);
     /// ```
     </span><span class="attribute">#[inline]
     </span><span class="kw">fn </span>num_seconds_from_midnight(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; u32 {
         <span class="self">self</span>.secs <span class="comment">// do not repeat the calculation!
     </span>}
 }

 <span class="doccomment">/// An addition of `Duration` to `NaiveTime` wraps around and never overflows or underflows.
 /// In particular the addition ignores integral number of days.
 ///
 /// As a part of Chrono&#39;s [leap second handling], the addition assumes that **there is no leap
 /// second ever**, except when the `NaiveTime` itself represents a leap second in which case the
 /// assumption becomes that **there is exactly a single leap second ever**.
 ///
 /// # Example
 ///
 /// ```
 /// use chrono::{Duration, NaiveTime};
 ///
 /// let from_hmsm = |h, m, s, milli| { NaiveTime::from_hms_milli_opt(h, m, s, milli).unwrap() };
 ///
 /// assert_eq!(from_hmsm(3, 5, 7, 0) + Duration::zero(),                  from_hmsm(3, 5, 7, 0));
 /// assert_eq!(from_hmsm(3, 5, 7, 0) + Duration::seconds(1),              from_hmsm(3, 5, 8, 0));
 /// assert_eq!(from_hmsm(3, 5, 7, 0) + Duration::seconds(-1),             from_hmsm(3, 5, 6, 0));
 /// assert_eq!(from_hmsm(3, 5, 7, 0) + Duration::seconds(60 + 4),         from_hmsm(3, 6, 11, 0));
 /// assert_eq!(from_hmsm(3, 5, 7, 0) + Duration::seconds(7*60*60 - 6*60), from_hmsm(9, 59, 7, 0));
 /// assert_eq!(from_hmsm(3, 5, 7, 0) + Duration::milliseconds(80),        from_hmsm(3, 5, 7, 80));
 /// assert_eq!(from_hmsm(3, 5, 7, 950) + Duration::milliseconds(280),     from_hmsm(3, 5, 8, 230));
 /// assert_eq!(from_hmsm(3, 5, 7, 950) + Duration::milliseconds(-980),    from_hmsm(3, 5, 6, 970));
 /// ```
 ///
 /// The addition wraps around.
 ///
 /// ```
 /// # use chrono::{Duration, NaiveTime};
 /// # let from_hmsm = |h, m, s, milli| { NaiveTime::from_hms_milli_opt(h, m, s, milli).unwrap() };
 /// assert_eq!(from_hmsm(3, 5, 7, 0) + Duration::seconds(22*60*60), from_hmsm(1, 5, 7, 0));
 /// assert_eq!(from_hmsm(3, 5, 7, 0) + Duration::seconds(-8*60*60), from_hmsm(19, 5, 7, 0));
 /// assert_eq!(from_hmsm(3, 5, 7, 0) + Duration::days(800),         from_hmsm(3, 5, 7, 0));
 /// ```
 ///
 /// Leap seconds are handled, but the addition assumes that it is the only leap second happened.
 ///
 /// ```
 /// # use chrono::{Duration, NaiveTime};
 /// # let from_hmsm = |h, m, s, milli| { NaiveTime::from_hms_milli_opt(h, m, s, milli).unwrap() };
 /// let leap = from_hmsm(3, 5, 59, 1_300);
 /// assert_eq!(leap + Duration::zero(),             from_hmsm(3, 5, 59, 1_300));
 /// assert_eq!(leap + Duration::milliseconds(-500), from_hmsm(3, 5, 59, 800));
 /// assert_eq!(leap + Duration::milliseconds(500),  from_hmsm(3, 5, 59, 1_800));
 /// assert_eq!(leap + Duration::milliseconds(800),  from_hmsm(3, 6, 0, 100));
 /// assert_eq!(leap + Duration::seconds(10),        from_hmsm(3, 6, 9, 300));
 /// assert_eq!(leap + Duration::seconds(-10),       from_hmsm(3, 5, 50, 300));
 /// assert_eq!(leap + Duration::days(1),            from_hmsm(3, 5, 59, 300));
 /// ```
 ///
 /// [leap second handling]: crate::NaiveTime#leap-second-handling
 </span><span class="kw">impl </span>Add&lt;OldDuration&gt; <span class="kw">for </span>NaiveTime {
     <span class="kw">type </span>Output = NaiveTime;

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>add(<span class="self">self</span>, rhs: OldDuration) -&gt; NaiveTime {
         <span class="self">self</span>.overflowing_add_signed(rhs).<span class="number">0
     </span>}
 }

 <span class="kw">impl </span>AddAssign&lt;OldDuration&gt; <span class="kw">for </span>NaiveTime {
     <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-2">*</span><span class="self">self </span>= <span class="self">self</span>.add(rhs);
     }
 }

 <span class="doccomment">/// A subtraction of `Duration` from `NaiveTime` wraps around and never overflows or underflows.
 /// In particular the addition ignores integral number of days.
 /// It is the same as the addition with a negated `Duration`.
 ///
 /// As a part of Chrono&#39;s [leap second handling], the subtraction assumes that **there is no leap
 /// second ever**, except when the `NaiveTime` itself represents a leap second in which case the
 /// assumption becomes that **there is exactly a single leap second ever**.
 ///
 /// # Example
 ///
 /// ```
 /// use chrono::{Duration, NaiveTime};
 ///
 /// let from_hmsm = |h, m, s, milli| { NaiveTime::from_hms_milli_opt(h, m, s, milli).unwrap() };
 ///
 /// assert_eq!(from_hmsm(3, 5, 7, 0) - Duration::zero(),                  from_hmsm(3, 5, 7, 0));
 /// assert_eq!(from_hmsm(3, 5, 7, 0) - Duration::seconds(1),              from_hmsm(3, 5, 6, 0));
 /// assert_eq!(from_hmsm(3, 5, 7, 0) - Duration::seconds(60 + 5),         from_hmsm(3, 4, 2, 0));
 /// assert_eq!(from_hmsm(3, 5, 7, 0) - Duration::seconds(2*60*60 + 6*60), from_hmsm(0, 59, 7, 0));
 /// assert_eq!(from_hmsm(3, 5, 7, 0) - Duration::milliseconds(80),        from_hmsm(3, 5, 6, 920));
 /// assert_eq!(from_hmsm(3, 5, 7, 950) - Duration::milliseconds(280),     from_hmsm(3, 5, 7, 670));
 /// ```
 ///
 /// The subtraction wraps around.
 ///
 /// ```
 /// # use chrono::{Duration, NaiveTime};
 /// # let from_hmsm = |h, m, s, milli| { NaiveTime::from_hms_milli_opt(h, m, s, milli).unwrap() };
 /// assert_eq!(from_hmsm(3, 5, 7, 0) - Duration::seconds(8*60*60), from_hmsm(19, 5, 7, 0));
 /// assert_eq!(from_hmsm(3, 5, 7, 0) - Duration::days(800),        from_hmsm(3, 5, 7, 0));
 /// ```
 ///
 /// Leap seconds are handled, but the subtraction assumes that it is the only leap second happened.
 ///
 /// ```
 /// # use chrono::{Duration, NaiveTime};
 /// # let from_hmsm = |h, m, s, milli| { NaiveTime::from_hms_milli_opt(h, m, s, milli).unwrap() };
 /// let leap = from_hmsm(3, 5, 59, 1_300);
 /// assert_eq!(leap - Duration::zero(),            from_hmsm(3, 5, 59, 1_300));
 /// assert_eq!(leap - Duration::milliseconds(200), from_hmsm(3, 5, 59, 1_100));
 /// assert_eq!(leap - Duration::milliseconds(500), from_hmsm(3, 5, 59, 800));
 /// assert_eq!(leap - Duration::seconds(60),       from_hmsm(3, 5, 0, 300));
 /// assert_eq!(leap - Duration::days(1),           from_hmsm(3, 6, 0, 300));
 /// ```
 ///
 /// [leap second handling]: crate::NaiveTime#leap-second-handling
 </span><span class="kw">impl </span>Sub&lt;OldDuration&gt; <span class="kw">for </span>NaiveTime {
     <span class="kw">type </span>Output = NaiveTime;

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>sub(<span class="self">self</span>, rhs: OldDuration) -&gt; NaiveTime {
         <span class="self">self</span>.overflowing_sub_signed(rhs).<span class="number">0
     </span>}
 }

 <span class="kw">impl </span>SubAssign&lt;OldDuration&gt; <span class="kw">for </span>NaiveTime {
     <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-2">*</span><span class="self">self </span>= <span class="self">self</span>.sub(rhs);
     }
 }

 <span class="doccomment">/// Subtracts another `NaiveTime` from the current time.
 /// Returns a `Duration` within +/- 1 day.
 /// This does not overflow or underflow at all.
 ///
 /// As a part of Chrono&#39;s [leap second handling](#leap-second-handling),
 /// the subtraction assumes that **there is no leap second ever**,
 /// except when any of the `NaiveTime`s themselves represents a leap second
 /// in which case the assumption becomes that
 /// **there are exactly one (or two) leap second(s) ever**.
 ///
 /// The implementation is a wrapper around
 /// [`NaiveTime::signed_duration_since`](#method.signed_duration_since).
 ///
 /// # Example
 ///
 /// ```
 /// use chrono::{Duration, NaiveTime};
 ///
 /// let from_hmsm = |h, m, s, milli| { NaiveTime::from_hms_milli_opt(h, m, s, milli).unwrap() };
 ///
 /// assert_eq!(from_hmsm(3, 5, 7, 900) - from_hmsm(3, 5, 7, 900), Duration::zero());
 /// assert_eq!(from_hmsm(3, 5, 7, 900) - from_hmsm(3, 5, 7, 875), Duration::milliseconds(25));
 /// assert_eq!(from_hmsm(3, 5, 7, 900) - from_hmsm(3, 5, 6, 925), Duration::milliseconds(975));
 /// assert_eq!(from_hmsm(3, 5, 7, 900) - from_hmsm(3, 5, 0, 900), Duration::seconds(7));
 /// assert_eq!(from_hmsm(3, 5, 7, 900) - from_hmsm(3, 0, 7, 900), Duration::seconds(5 * 60));
 /// assert_eq!(from_hmsm(3, 5, 7, 900) - from_hmsm(0, 5, 7, 900), Duration::seconds(3 * 3600));
 /// assert_eq!(from_hmsm(3, 5, 7, 900) - from_hmsm(4, 5, 7, 900), Duration::seconds(-3600));
 /// assert_eq!(from_hmsm(3, 5, 7, 900) - from_hmsm(2, 4, 6, 800),
 ///            Duration::seconds(3600 + 60 + 1) + Duration::milliseconds(100));
 /// ```
 ///
 /// Leap seconds are handled, but the subtraction assumes that
 /// there were no other leap seconds happened.
 ///
 /// ```
 /// # use chrono::{Duration, NaiveTime};
 /// # let from_hmsm = |h, m, s, milli| { NaiveTime::from_hms_milli_opt(h, m, s, milli).unwrap() };
 /// assert_eq!(from_hmsm(3, 0, 59, 1_000) - from_hmsm(3, 0, 59, 0), Duration::seconds(1));
 /// assert_eq!(from_hmsm(3, 0, 59, 1_500) - from_hmsm(3, 0, 59, 0),
 ///            Duration::milliseconds(1500));
 /// assert_eq!(from_hmsm(3, 0, 59, 1_000) - from_hmsm(3, 0, 0, 0), Duration::seconds(60));
 /// assert_eq!(from_hmsm(3, 0, 0, 0) - from_hmsm(2, 59, 59, 1_000), Duration::seconds(1));
 /// assert_eq!(from_hmsm(3, 0, 59, 1_000) - from_hmsm(2, 59, 59, 1_000),
 ///            Duration::seconds(61));
 /// ```
 </span><span class="kw">impl </span>Sub&lt;NaiveTime&gt; <span class="kw">for </span>NaiveTime {
     <span class="kw">type </span>Output = OldDuration;

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

 <span class="doccomment">/// The `Debug` output of the naive time `t` is the same as
 /// [`t.format(&quot;%H:%M:%S%.f&quot;)`](../format/strftime/index.html).
 ///
 /// The string printed can be readily parsed via the `parse` method on `str`.
 ///
 /// It should be noted that, for leap seconds not on the minute boundary,
 /// it may print a representation not distinguishable from non-leap seconds.
 /// This doesn&#39;t matter in practice, since such leap seconds never happened.
 /// (By the time of the first leap second on 1972-06-30,
 /// every time zone offset around the world has standardized to the 5-minute alignment.)
 ///
 /// # Example
 ///
 /// ```
 /// use chrono::NaiveTime;
 ///
 /// assert_eq!(format!(&quot;{:?}&quot;, NaiveTime::from_hms_opt(23, 56, 4).unwrap()),              &quot;23:56:04&quot;);
 /// assert_eq!(format!(&quot;{:?}&quot;, NaiveTime::from_hms_milli_opt(23, 56, 4, 12).unwrap()),    &quot;23:56:04.012&quot;);
 /// assert_eq!(format!(&quot;{:?}&quot;, NaiveTime::from_hms_micro_opt(23, 56, 4, 1234).unwrap()),  &quot;23:56:04.001234&quot;);
 /// assert_eq!(format!(&quot;{:?}&quot;, NaiveTime::from_hms_nano_opt(23, 56, 4, 123456).unwrap()), &quot;23:56:04.000123456&quot;);
 /// ```
 ///
 /// Leap seconds may also be used.
 ///
 /// ```
 /// # use chrono::NaiveTime;
 /// assert_eq!(format!(&quot;{:?}&quot;, NaiveTime::from_hms_milli_opt(6, 59, 59, 1_500).unwrap()), &quot;06:59:60.500&quot;);
 /// ```
 </span><span class="kw">impl </span>fmt::Debug <span class="kw">for </span>NaiveTime {
     <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">let </span>(hour, min, sec) = <span class="self">self</span>.hms();
         <span class="kw">let </span>(sec, nano) = <span class="kw">if </span><span class="self">self</span>.frac &gt;= <span class="number">1_000_000_000 </span>{
             (sec + <span class="number">1</span>, <span class="self">self</span>.frac - <span class="number">1_000_000_000</span>)
         } <span class="kw">else </span>{
             (sec, <span class="self">self</span>.frac)
         };

         <span class="kw">use </span>core::fmt::Write;
         write_hundreds(f, hour <span class="kw">as </span>u8)<span class="question-mark">?</span>;
         f.write_char(<span class="string">&#39;:&#39;</span>)<span class="question-mark">?</span>;
         write_hundreds(f, min <span class="kw">as </span>u8)<span class="question-mark">?</span>;
         f.write_char(<span class="string">&#39;:&#39;</span>)<span class="question-mark">?</span>;
         write_hundreds(f, sec <span class="kw">as </span>u8)<span class="question-mark">?</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>(f, <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>(f, <span class="string">&quot;.{:06}&quot;</span>, nano / <span class="number">1_000</span>)
         } <span class="kw">else </span>{
             <span class="macro">write!</span>(f, <span class="string">&quot;.{:09}&quot;</span>, nano)
         }
     }
 }

 <span class="doccomment">/// The `Display` output of the naive time `t` is the same as
 /// [`t.format(&quot;%H:%M:%S%.f&quot;)`](../format/strftime/index.html).
 ///
 /// The string printed can be readily parsed via the `parse` method on `str`.
 ///
 /// It should be noted that, for leap seconds not on the minute boundary,
 /// it may print a representation not distinguishable from non-leap seconds.
 /// This doesn&#39;t matter in practice, since such leap seconds never happened.
 /// (By the time of the first leap second on 1972-06-30,
 /// every time zone offset around the world has standardized to the 5-minute alignment.)
 ///
 /// # Example
 ///
 /// ```
 /// use chrono::NaiveTime;
 ///
 /// assert_eq!(format!(&quot;{}&quot;, NaiveTime::from_hms_opt(23, 56, 4).unwrap()),              &quot;23:56:04&quot;);
 /// assert_eq!(format!(&quot;{}&quot;, NaiveTime::from_hms_milli_opt(23, 56, 4, 12).unwrap()),    &quot;23:56:04.012&quot;);
 /// assert_eq!(format!(&quot;{}&quot;, NaiveTime::from_hms_micro_opt(23, 56, 4, 1234).unwrap()),  &quot;23:56:04.001234&quot;);
 /// assert_eq!(format!(&quot;{}&quot;, NaiveTime::from_hms_nano_opt(23, 56, 4, 123456).unwrap()), &quot;23:56:04.000123456&quot;);
 /// ```
 ///
 /// Leap seconds may also be used.
 ///
 /// ```
 /// # use chrono::NaiveTime;
 /// assert_eq!(format!(&quot;{}&quot;, NaiveTime::from_hms_milli_opt(6, 59, 59, 1_500).unwrap()), &quot;06:59:60.500&quot;);
 /// ```
 </span><span class="kw">impl </span>fmt::Display <span class="kw">for </span>NaiveTime {
     <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 {
         fmt::Debug::fmt(<span class="self">self</span>, f)
     }
 }

 <span class="doccomment">/// Parsing a `str` into a `NaiveTime` uses the same format,
 /// [`%H:%M:%S%.f`](../format/strftime/index.html), as in `Debug` and `Display`.
 ///
 /// # Example
 ///
 /// ```
 /// use chrono::NaiveTime;
 ///
 /// let t = NaiveTime::from_hms_opt(23, 56, 4).unwrap();
 /// assert_eq!(&quot;23:56:04&quot;.parse::&lt;NaiveTime&gt;(), Ok(t));
 ///
 /// let t = NaiveTime::from_hms_nano_opt(23, 56, 4, 12_345_678).unwrap();
 /// assert_eq!(&quot;23:56:4.012345678&quot;.parse::&lt;NaiveTime&gt;(), Ok(t));
 ///
 /// let t = NaiveTime::from_hms_nano_opt(23, 59, 59, 1_234_567_890).unwrap(); // leap second
 /// assert_eq!(&quot;23:59:60.23456789&quot;.parse::&lt;NaiveTime&gt;(), Ok(t));
 ///
 /// assert!(&quot;foo&quot;.parse::&lt;NaiveTime&gt;().is_err());
 /// ```
 </span><span class="kw">impl </span>str::FromStr <span class="kw">for </span>NaiveTime {
     <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;NaiveTime&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::Numeric(Numeric::Hour, Pad::Zero),
             Item::Space(<span class="string">&quot;&quot;</span>),
             Item::Literal(<span class="string">&quot;:&quot;</span>),
             Item::Numeric(Numeric::Minute, Pad::Zero),
             Item::Space(<span class="string">&quot;&quot;</span>),
             Item::Literal(<span class="string">&quot;:&quot;</span>),
             Item::Numeric(Numeric::Second, Pad::Zero),
             Item::Fixed(Fixed::Nanosecond),
             Item::Space(<span class="string">&quot;&quot;</span>),
         ];

         <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_naive_time()
     }
 }

 <span class="doccomment">/// The default value for a NaiveTime is midnight, 00:00:00 exactly.
 ///
 /// # Example
 ///
 /// ```rust
 /// use chrono::NaiveTime;
 ///
 /// let default_time = NaiveTime::default();
 /// assert_eq!(default_time, NaiveTime::from_hms_opt(0, 0, 0).unwrap());
 /// ```
 </span><span class="kw">impl </span>Default <span class="kw">for </span>NaiveTime {
     <span class="kw">fn </span>default() -&gt; <span class="self">Self </span>{
         NaiveTime::from_hms_opt(<span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>).unwrap()
     }
 }

 <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;F, E&gt;(to_string: F)
 <span class="kw">where
     </span>F: Fn(<span class="kw-2">&amp;</span>NaiveTime) -&gt; <span class="prelude-ty">Result</span>&lt;String, E&gt;,
     E: ::std::fmt::Debug,
 {
     <span class="macro">assert_eq!</span>(
         to_string(<span class="kw-2">&amp;</span>NaiveTime::from_hms_opt(<span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>).unwrap()).ok(),
         <span class="prelude-val">Some</span>(<span class="string">r#&quot;&quot;00:00:00&quot;&quot;#</span>.into())
     );
     <span class="macro">assert_eq!</span>(
         to_string(<span class="kw-2">&amp;</span>NaiveTime::from_hms_milli_opt(<span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">950</span>).unwrap()).ok(),
         <span class="prelude-val">Some</span>(<span class="string">r#&quot;&quot;00:00:00.950&quot;&quot;#</span>.into())
     );
     <span class="macro">assert_eq!</span>(
         to_string(<span class="kw-2">&amp;</span>NaiveTime::from_hms_milli_opt(<span class="number">0</span>, <span class="number">0</span>, <span class="number">59</span>, <span class="number">1_000</span>).unwrap()).ok(),
         <span class="prelude-val">Some</span>(<span class="string">r#&quot;&quot;00:00:60&quot;&quot;#</span>.into())
     );
     <span class="macro">assert_eq!</span>(
         to_string(<span class="kw-2">&amp;</span>NaiveTime::from_hms_opt(<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>).unwrap()).ok(),
         <span class="prelude-val">Some</span>(<span class="string">r#&quot;&quot;00:01:02&quot;&quot;#</span>.into())
     );
     <span class="macro">assert_eq!</span>(
         to_string(<span class="kw-2">&amp;</span>NaiveTime::from_hms_nano_opt(<span class="number">3</span>, <span class="number">5</span>, <span class="number">7</span>, <span class="number">98765432</span>).unwrap()).ok(),
         <span class="prelude-val">Some</span>(<span class="string">r#&quot;&quot;03:05:07.098765432&quot;&quot;#</span>.into())
     );
     <span class="macro">assert_eq!</span>(
         to_string(<span class="kw-2">&amp;</span>NaiveTime::from_hms_opt(<span class="number">7</span>, <span class="number">8</span>, <span class="number">9</span>).unwrap()).ok(),
         <span class="prelude-val">Some</span>(<span class="string">r#&quot;&quot;07:08:09&quot;&quot;#</span>.into())
     );
     <span class="macro">assert_eq!</span>(
         to_string(<span class="kw-2">&amp;</span>NaiveTime::from_hms_micro_opt(<span class="number">12</span>, <span class="number">34</span>, <span class="number">56</span>, <span class="number">789</span>).unwrap()).ok(),
         <span class="prelude-val">Some</span>(<span class="string">r#&quot;&quot;12:34:56.000789&quot;&quot;#</span>.into())
     );
     <span class="macro">assert_eq!</span>(
         to_string(<span class="kw-2">&amp;</span>NaiveTime::from_hms_nano_opt(<span class="number">23</span>, <span class="number">59</span>, <span class="number">59</span>, <span class="number">1_999_999_999</span>).unwrap()).ok(),
         <span class="prelude-val">Some</span>(<span class="string">r#&quot;&quot;23:59:60.999999999&quot;&quot;#</span>.into())
     );
 }

 <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_decodable_json&lt;F, E&gt;(from_str: F)
 <span class="kw">where
     </span>F: Fn(<span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;NaiveTime, E&gt;,
     E: ::std::fmt::Debug,
 {
     <span class="macro">assert_eq!</span>(from_str(<span class="string">r#&quot;&quot;00:00:00&quot;&quot;#</span>).ok(), <span class="prelude-val">Some</span>(NaiveTime::from_hms_opt(<span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>).unwrap()));
     <span class="macro">assert_eq!</span>(from_str(<span class="string">r#&quot;&quot;0:0:0&quot;&quot;#</span>).ok(), <span class="prelude-val">Some</span>(NaiveTime::from_hms_opt(<span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>).unwrap()));
     <span class="macro">assert_eq!</span>(
         from_str(<span class="string">r#&quot;&quot;00:00:00.950&quot;&quot;#</span>).ok(),
         <span class="prelude-val">Some</span>(NaiveTime::from_hms_milli_opt(<span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">950</span>).unwrap())
     );
     <span class="macro">assert_eq!</span>(
         from_str(<span class="string">r#&quot;&quot;0:0:0.95&quot;&quot;#</span>).ok(),
         <span class="prelude-val">Some</span>(NaiveTime::from_hms_milli_opt(<span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">950</span>).unwrap())
     );
     <span class="macro">assert_eq!</span>(
         from_str(<span class="string">r#&quot;&quot;00:00:60&quot;&quot;#</span>).ok(),
         <span class="prelude-val">Some</span>(NaiveTime::from_hms_milli_opt(<span class="number">0</span>, <span class="number">0</span>, <span class="number">59</span>, <span class="number">1_000</span>).unwrap())
     );
     <span class="macro">assert_eq!</span>(from_str(<span class="string">r#&quot;&quot;00:01:02&quot;&quot;#</span>).ok(), <span class="prelude-val">Some</span>(NaiveTime::from_hms_opt(<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>).unwrap()));
     <span class="macro">assert_eq!</span>(
         from_str(<span class="string">r#&quot;&quot;03:05:07.098765432&quot;&quot;#</span>).ok(),
         <span class="prelude-val">Some</span>(NaiveTime::from_hms_nano_opt(<span class="number">3</span>, <span class="number">5</span>, <span class="number">7</span>, <span class="number">98765432</span>).unwrap())
     );
     <span class="macro">assert_eq!</span>(from_str(<span class="string">r#&quot;&quot;07:08:09&quot;&quot;#</span>).ok(), <span class="prelude-val">Some</span>(NaiveTime::from_hms_opt(<span class="number">7</span>, <span class="number">8</span>, <span class="number">9</span>).unwrap()));
     <span class="macro">assert_eq!</span>(
         from_str(<span class="string">r#&quot;&quot;12:34:56.000789&quot;&quot;#</span>).ok(),
         <span class="prelude-val">Some</span>(NaiveTime::from_hms_micro_opt(<span class="number">12</span>, <span class="number">34</span>, <span class="number">56</span>, <span class="number">789</span>).unwrap())
     );
     <span class="macro">assert_eq!</span>(
         from_str(<span class="string">r#&quot;&quot;23:59:60.999999999&quot;&quot;#</span>).ok(),
         <span class="prelude-val">Some</span>(NaiveTime::from_hms_nano_opt(<span class="number">23</span>, <span class="number">59</span>, <span class="number">59</span>, <span class="number">1_999_999_999</span>).unwrap())
     );
     <span class="macro">assert_eq!</span>(
         from_str(<span class="string">r#&quot;&quot;23:59:60.9999999999997&quot;&quot;#</span>).ok(), <span class="comment">// excess digits are ignored
         </span><span class="prelude-val">Some</span>(NaiveTime::from_hms_nano_opt(<span class="number">23</span>, <span class="number">59</span>, <span class="number">59</span>, <span class="number">1_999_999_999</span>).unwrap())
     );

     <span class="comment">// bad formats
     </span><span class="macro">assert!</span>(from_str(<span class="string">r#&quot;&quot;&quot;&quot;#</span>).is_err());
     <span class="macro">assert!</span>(from_str(<span class="string">r#&quot;&quot;000000&quot;&quot;#</span>).is_err());
     <span class="macro">assert!</span>(from_str(<span class="string">r#&quot;&quot;00:00:61&quot;&quot;#</span>).is_err());
     <span class="macro">assert!</span>(from_str(<span class="string">r#&quot;&quot;00:60:00&quot;&quot;#</span>).is_err());
     <span class="macro">assert!</span>(from_str(<span class="string">r#&quot;&quot;24:00:00&quot;&quot;#</span>).is_err());
     <span class="macro">assert!</span>(from_str(<span class="string">r#&quot;&quot;23:59:59,1&quot;&quot;#</span>).is_err());
     <span class="macro">assert!</span>(from_str(<span class="string">r#&quot;&quot;012:34:56&quot;&quot;#</span>).is_err());
     <span class="macro">assert!</span>(from_str(<span class="string">r#&quot;&quot;hh:mm:ss&quot;&quot;#</span>).is_err());
     <span class="macro">assert!</span>(from_str(<span class="string">r#&quot;0&quot;#</span>).is_err());
     <span class="macro">assert!</span>(from_str(<span class="string">r#&quot;86399&quot;#</span>).is_err());
     <span class="macro">assert!</span>(from_str(<span class="string">r#&quot;{}&quot;#</span>).is_err());
     <span class="comment">// pre-0.3.0 rustc-serialize format is now invalid
     </span><span class="macro">assert!</span>(from_str(<span class="string">r#&quot;{&quot;secs&quot;:0,&quot;frac&quot;:0}&quot;#</span>).is_err());
     <span class="macro">assert!</span>(from_str(<span class="string">r#&quot;null&quot;#</span>).is_err());
 }
 </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>