chrono/offset/local/
mod.rs

1// This is a part of Chrono.
2// See README.md and LICENSE.txt for details.
3
4//! The local (system) time zone.
5
6#[cfg(windows)]
7use std::cmp::Ordering;
8
9#[cfg(any(feature = "rkyv", feature = "rkyv-16", feature = "rkyv-32", feature = "rkyv-64"))]
10use rkyv::{Archive, Deserialize, Serialize};
11
12use super::fixed::FixedOffset;
13use super::{MappedLocalTime, TimeZone};
14#[allow(deprecated)]
15use crate::Date;
16use crate::naive::{NaiveDate, NaiveDateTime, NaiveTime};
17use crate::{DateTime, Utc};
18
19#[cfg(unix)]
20#[path = "unix.rs"]
21mod inner;
22
23#[cfg(windows)]
24#[path = "windows.rs"]
25mod inner;
26
27#[cfg(all(windows, feature = "clock"))]
28#[allow(unreachable_pub)]
29mod win_bindings;
30
31#[cfg(all(any(target_os = "android", target_env = "ohos", test), feature = "clock"))]
32mod tz_data;
33
34#[cfg(all(
35    not(unix),
36    not(windows),
37    not(all(
38        target_arch = "wasm32",
39        feature = "wasmbind",
40        not(any(target_os = "emscripten", target_os = "wasi"))
41    ))
42))]
43mod inner {
44    use crate::{FixedOffset, MappedLocalTime, NaiveDateTime};
45
46    pub(super) fn offset_from_utc_datetime(
47        _utc_time: &NaiveDateTime,
48    ) -> MappedLocalTime<FixedOffset> {
49        MappedLocalTime::Single(FixedOffset::east_opt(0).unwrap())
50    }
51
52    pub(super) fn offset_from_local_datetime(
53        _local_time: &NaiveDateTime,
54    ) -> MappedLocalTime<FixedOffset> {
55        MappedLocalTime::Single(FixedOffset::east_opt(0).unwrap())
56    }
57}
58
59#[cfg(all(
60    target_arch = "wasm32",
61    feature = "wasmbind",
62    not(any(target_os = "emscripten", target_os = "wasi", target_os = "linux"))
63))]
64mod inner {
65    use crate::{Datelike, FixedOffset, MappedLocalTime, NaiveDateTime, Timelike};
66
67    pub(super) fn offset_from_utc_datetime(utc: &NaiveDateTime) -> MappedLocalTime<FixedOffset> {
68        let offset = js_sys::Date::from(utc.and_utc()).get_timezone_offset();
69        MappedLocalTime::Single(FixedOffset::west_opt((offset as i32) * 60).unwrap())
70    }
71
72    pub(super) fn offset_from_local_datetime(
73        local: &NaiveDateTime,
74    ) -> MappedLocalTime<FixedOffset> {
75        let mut year = local.year();
76        if year < 100 {
77            // The API in `js_sys` does not let us create a `Date` with negative years.
78            // And values for years from `0` to `99` map to the years `1900` to `1999`.
79            // Shift the value by a multiple of 400 years until it is `>= 100`.
80            let shift_cycles = (year - 100).div_euclid(400);
81            year -= shift_cycles * 400;
82        }
83        let js_date = js_sys::Date::new_with_year_month_day_hr_min_sec(
84            year as u32,
85            local.month0() as i32,
86            local.day() as i32,
87            local.hour() as i32,
88            local.minute() as i32,
89            local.second() as i32,
90            // ignore milliseconds, our representation of leap seconds may be problematic
91        );
92        let offset = js_date.get_timezone_offset();
93        // We always get a result, even if this time does not exist or is ambiguous.
94        MappedLocalTime::Single(FixedOffset::west_opt((offset as i32) * 60).unwrap())
95    }
96}
97
98#[cfg(unix)]
99mod tz_info;
100
101/// The local timescale.
102///
103/// Using the [`TimeZone`](./trait.TimeZone.html) methods
104/// on the Local struct is the preferred way to construct `DateTime<Local>`
105/// instances.
106///
107/// # Example
108///
109/// ```
110/// use chrono::{DateTime, Local, TimeZone};
111///
112/// let dt1: DateTime<Local> = Local::now();
113/// let dt2: DateTime<Local> = Local.timestamp_opt(0, 0).unwrap();
114/// assert!(dt1 >= dt2);
115/// ```
116#[derive(Copy, Clone, Debug)]
117#[cfg_attr(
118    any(feature = "rkyv", feature = "rkyv-16", feature = "rkyv-32", feature = "rkyv-64"),
119    derive(Archive, Deserialize, Serialize),
120    archive(compare(PartialEq)),
121    archive_attr(derive(Clone, Copy, Debug))
122)]
123#[cfg_attr(feature = "rkyv-validation", archive(check_bytes))]
124#[cfg_attr(feature = "arbitrary", derive(arbitrary::Arbitrary))]
125pub struct Local;
126
127impl Local {
128    /// Returns a `Date` which corresponds to the current date.
129    #[deprecated(since = "0.4.23", note = "use `Local::now()` instead")]
130    #[allow(deprecated)]
131    #[must_use]
132    pub fn today() -> Date<Local> {
133        Local::now().date()
134    }
135
136    /// Returns a `DateTime<Local>` which corresponds to the current date, time and offset from
137    /// UTC.
138    ///
139    /// See also the similar [`Utc::now()`] which returns `DateTime<Utc>`, i.e. without the local
140    /// offset.
141    ///
142    /// # Example
143    ///
144    /// ```
145    /// # #![allow(unused_variables)]
146    /// # use chrono::{DateTime, FixedOffset, Local};
147    /// // Current local time
148    /// let now = Local::now();
149    ///
150    /// // Current local date
151    /// let today = now.date_naive();
152    ///
153    /// // Current local time, converted to `DateTime<FixedOffset>`
154    /// let now_fixed_offset = Local::now().fixed_offset();
155    /// // or
156    /// let now_fixed_offset: DateTime<FixedOffset> = Local::now().into();
157    ///
158    /// // Current time in some timezone (let's use +05:00)
159    /// // Note that it is usually more efficient to use `Utc::now` for this use case.
160    /// let offset = FixedOffset::east_opt(5 * 60 * 60).unwrap();
161    /// let now_with_offset = Local::now().with_timezone(&offset);
162    /// ```
163    pub fn now() -> DateTime<Local> {
164        Utc::now().with_timezone(&Local)
165    }
166}
167
168impl TimeZone for Local {
169    type Offset = FixedOffset;
170
171    fn from_offset(_offset: &FixedOffset) -> Local {
172        Local
173    }
174
175    #[allow(deprecated)]
176    fn offset_from_local_date(&self, local: &NaiveDate) -> MappedLocalTime<FixedOffset> {
177        // Get the offset at local midnight.
178        self.offset_from_local_datetime(&local.and_time(NaiveTime::MIN))
179    }
180
181    fn offset_from_local_datetime(&self, local: &NaiveDateTime) -> MappedLocalTime<FixedOffset> {
182        inner::offset_from_local_datetime(local)
183    }
184
185    #[allow(deprecated)]
186    fn offset_from_utc_date(&self, utc: &NaiveDate) -> FixedOffset {
187        // Get the offset at midnight.
188        self.offset_from_utc_datetime(&utc.and_time(NaiveTime::MIN))
189    }
190
191    fn offset_from_utc_datetime(&self, utc: &NaiveDateTime) -> FixedOffset {
192        inner::offset_from_utc_datetime(utc).unwrap()
193    }
194}
195
196#[cfg(windows)]
197#[derive(Copy, Clone, Eq, PartialEq)]
198struct Transition {
199    transition_utc: NaiveDateTime,
200    offset_before: FixedOffset,
201    offset_after: FixedOffset,
202}
203
204#[cfg(windows)]
205impl Transition {
206    fn new(
207        transition_local: NaiveDateTime,
208        offset_before: FixedOffset,
209        offset_after: FixedOffset,
210    ) -> Transition {
211        // It is no problem if the transition time in UTC falls a couple of hours inside the buffer
212        // space around the `NaiveDateTime` range (although it is very theoretical to have a
213        // transition at midnight around `NaiveDate::(MIN|MAX)`.
214        let transition_utc = transition_local.overflowing_sub_offset(offset_before);
215        Transition { transition_utc, offset_before, offset_after }
216    }
217}
218
219#[cfg(windows)]
220impl PartialOrd for Transition {
221    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
222        Some(self.cmp(other))
223    }
224}
225
226#[cfg(windows)]
227impl Ord for Transition {
228    fn cmp(&self, other: &Self) -> Ordering {
229        self.transition_utc.cmp(&other.transition_utc)
230    }
231}
232
233// Calculate the time in UTC given a local time and transitions.
234// `transitions` must be sorted.
235#[cfg(windows)]
236fn lookup_with_dst_transitions(
237    transitions: &[Transition],
238    dt: NaiveDateTime,
239) -> MappedLocalTime<FixedOffset> {
240    for t in transitions.iter() {
241        // A transition can result in the wall clock time going forward (creating a gap) or going
242        // backward (creating a fold). We are interested in the earliest and latest wall time of the
243        // transition, as this are the times between which `dt` does may not exist or is ambiguous.
244        //
245        // It is no problem if the transition times falls a couple of hours inside the buffer
246        // space around the `NaiveDateTime` range (although it is very theoretical to have a
247        // transition at midnight around `NaiveDate::(MIN|MAX)`.
248        let (offset_min, offset_max) =
249            match t.offset_after.local_minus_utc() > t.offset_before.local_minus_utc() {
250                true => (t.offset_before, t.offset_after),
251                false => (t.offset_after, t.offset_before),
252            };
253        let wall_earliest = t.transition_utc.overflowing_add_offset(offset_min);
254        let wall_latest = t.transition_utc.overflowing_add_offset(offset_max);
255
256        if dt < wall_earliest {
257            return MappedLocalTime::Single(t.offset_before);
258        } else if dt <= wall_latest {
259            return match t.offset_after.local_minus_utc().cmp(&t.offset_before.local_minus_utc()) {
260                Ordering::Equal => MappedLocalTime::Single(t.offset_before),
261                Ordering::Less => MappedLocalTime::Ambiguous(t.offset_before, t.offset_after),
262                Ordering::Greater => {
263                    if dt == wall_earliest {
264                        MappedLocalTime::Single(t.offset_before)
265                    } else if dt == wall_latest {
266                        MappedLocalTime::Single(t.offset_after)
267                    } else {
268                        MappedLocalTime::None
269                    }
270                }
271            };
272        }
273    }
274    MappedLocalTime::Single(transitions.last().unwrap().offset_after)
275}
276
277#[cfg(test)]
278mod tests {
279    use super::Local;
280    use crate::offset::TimeZone;
281    #[cfg(windows)]
282    use crate::offset::local::{Transition, lookup_with_dst_transitions};
283    use crate::{Datelike, Days, Utc};
284    #[cfg(windows)]
285    use crate::{FixedOffset, MappedLocalTime, NaiveDate, NaiveDateTime};
286
287    #[test]
288    fn verify_correct_offsets() {
289        let now = Local::now();
290        let from_local = Local.from_local_datetime(&now.naive_local()).unwrap();
291        let from_utc = Local.from_utc_datetime(&now.naive_utc());
292
293        assert_eq!(now.offset().local_minus_utc(), from_local.offset().local_minus_utc());
294        assert_eq!(now.offset().local_minus_utc(), from_utc.offset().local_minus_utc());
295
296        assert_eq!(now, from_local);
297        assert_eq!(now, from_utc);
298    }
299
300    #[test]
301    fn verify_correct_offsets_distant_past() {
302        let distant_past = Local::now() - Days::new(365 * 500);
303        let from_local = Local.from_local_datetime(&distant_past.naive_local()).unwrap();
304        let from_utc = Local.from_utc_datetime(&distant_past.naive_utc());
305
306        assert_eq!(distant_past.offset().local_minus_utc(), from_local.offset().local_minus_utc());
307        assert_eq!(distant_past.offset().local_minus_utc(), from_utc.offset().local_minus_utc());
308
309        assert_eq!(distant_past, from_local);
310        assert_eq!(distant_past, from_utc);
311    }
312
313    #[test]
314    fn verify_correct_offsets_distant_future() {
315        let distant_future = Local::now() + Days::new(365 * 35000);
316        let from_local = Local.from_local_datetime(&distant_future.naive_local()).unwrap();
317        let from_utc = Local.from_utc_datetime(&distant_future.naive_utc());
318
319        assert_eq!(
320            distant_future.offset().local_minus_utc(),
321            from_local.offset().local_minus_utc()
322        );
323        assert_eq!(distant_future.offset().local_minus_utc(), from_utc.offset().local_minus_utc());
324
325        assert_eq!(distant_future, from_local);
326        assert_eq!(distant_future, from_utc);
327    }
328
329    #[test]
330    fn test_local_date_sanity_check() {
331        // issue #27
332        assert_eq!(Local.with_ymd_and_hms(2999, 12, 28, 0, 0, 0).unwrap().day(), 28);
333    }
334
335    #[test]
336    fn test_leap_second() {
337        // issue #123
338        let today = Utc::now().date_naive();
339
340        if let Some(dt) = today.and_hms_milli_opt(15, 2, 59, 1000) {
341            let timestr = dt.time().to_string();
342            // the OS API may or may not support the leap second,
343            // but there are only two sensible options.
344            assert!(
345                timestr == "15:02:60" || timestr == "15:03:00",
346                "unexpected timestr {timestr:?}"
347            );
348        }
349
350        if let Some(dt) = today.and_hms_milli_opt(15, 2, 3, 1234) {
351            let timestr = dt.time().to_string();
352            assert!(
353                timestr == "15:02:03.234" || timestr == "15:02:04.234",
354                "unexpected timestr {timestr:?}"
355            );
356        }
357    }
358
359    #[test]
360    #[cfg(windows)]
361    fn test_lookup_with_dst_transitions() {
362        let ymdhms = |y, m, d, h, n, s| {
363            NaiveDate::from_ymd_opt(y, m, d).unwrap().and_hms_opt(h, n, s).unwrap()
364        };
365
366        #[track_caller]
367        #[allow(clippy::too_many_arguments)]
368        fn compare_lookup(
369            transitions: &[Transition],
370            y: i32,
371            m: u32,
372            d: u32,
373            h: u32,
374            n: u32,
375            s: u32,
376            result: MappedLocalTime<FixedOffset>,
377        ) {
378            let dt = NaiveDate::from_ymd_opt(y, m, d).unwrap().and_hms_opt(h, n, s).unwrap();
379            assert_eq!(lookup_with_dst_transitions(transitions, dt), result);
380        }
381
382        // dst transition before std transition
383        // dst offset > std offset
384        let std = FixedOffset::east_opt(3 * 60 * 60).unwrap();
385        let dst = FixedOffset::east_opt(4 * 60 * 60).unwrap();
386        let transitions = [
387            Transition::new(ymdhms(2023, 3, 26, 2, 0, 0), std, dst),
388            Transition::new(ymdhms(2023, 10, 29, 3, 0, 0), dst, std),
389        ];
390        compare_lookup(&transitions, 2023, 3, 26, 1, 0, 0, MappedLocalTime::Single(std));
391        compare_lookup(&transitions, 2023, 3, 26, 2, 0, 0, MappedLocalTime::Single(std));
392        compare_lookup(&transitions, 2023, 3, 26, 2, 30, 0, MappedLocalTime::None);
393        compare_lookup(&transitions, 2023, 3, 26, 3, 0, 0, MappedLocalTime::Single(dst));
394        compare_lookup(&transitions, 2023, 3, 26, 4, 0, 0, MappedLocalTime::Single(dst));
395
396        compare_lookup(&transitions, 2023, 10, 29, 1, 0, 0, MappedLocalTime::Single(dst));
397        compare_lookup(&transitions, 2023, 10, 29, 2, 0, 0, MappedLocalTime::Ambiguous(dst, std));
398        compare_lookup(&transitions, 2023, 10, 29, 2, 30, 0, MappedLocalTime::Ambiguous(dst, std));
399        compare_lookup(&transitions, 2023, 10, 29, 3, 0, 0, MappedLocalTime::Ambiguous(dst, std));
400        compare_lookup(&transitions, 2023, 10, 29, 4, 0, 0, MappedLocalTime::Single(std));
401
402        // std transition before dst transition
403        // dst offset > std offset
404        let std = FixedOffset::east_opt(-5 * 60 * 60).unwrap();
405        let dst = FixedOffset::east_opt(-4 * 60 * 60).unwrap();
406        let transitions = [
407            Transition::new(ymdhms(2023, 3, 24, 3, 0, 0), dst, std),
408            Transition::new(ymdhms(2023, 10, 27, 2, 0, 0), std, dst),
409        ];
410        compare_lookup(&transitions, 2023, 3, 24, 1, 0, 0, MappedLocalTime::Single(dst));
411        compare_lookup(&transitions, 2023, 3, 24, 2, 0, 0, MappedLocalTime::Ambiguous(dst, std));
412        compare_lookup(&transitions, 2023, 3, 24, 2, 30, 0, MappedLocalTime::Ambiguous(dst, std));
413        compare_lookup(&transitions, 2023, 3, 24, 3, 0, 0, MappedLocalTime::Ambiguous(dst, std));
414        compare_lookup(&transitions, 2023, 3, 24, 4, 0, 0, MappedLocalTime::Single(std));
415
416        compare_lookup(&transitions, 2023, 10, 27, 1, 0, 0, MappedLocalTime::Single(std));
417        compare_lookup(&transitions, 2023, 10, 27, 2, 0, 0, MappedLocalTime::Single(std));
418        compare_lookup(&transitions, 2023, 10, 27, 2, 30, 0, MappedLocalTime::None);
419        compare_lookup(&transitions, 2023, 10, 27, 3, 0, 0, MappedLocalTime::Single(dst));
420        compare_lookup(&transitions, 2023, 10, 27, 4, 0, 0, MappedLocalTime::Single(dst));
421
422        // dst transition before std transition
423        // dst offset < std offset
424        let std = FixedOffset::east_opt(3 * 60 * 60).unwrap();
425        let dst = FixedOffset::east_opt((2 * 60 + 30) * 60).unwrap();
426        let transitions = [
427            Transition::new(ymdhms(2023, 3, 26, 2, 30, 0), std, dst),
428            Transition::new(ymdhms(2023, 10, 29, 2, 0, 0), dst, std),
429        ];
430        compare_lookup(&transitions, 2023, 3, 26, 1, 0, 0, MappedLocalTime::Single(std));
431        compare_lookup(&transitions, 2023, 3, 26, 2, 0, 0, MappedLocalTime::Ambiguous(std, dst));
432        compare_lookup(&transitions, 2023, 3, 26, 2, 15, 0, MappedLocalTime::Ambiguous(std, dst));
433        compare_lookup(&transitions, 2023, 3, 26, 2, 30, 0, MappedLocalTime::Ambiguous(std, dst));
434        compare_lookup(&transitions, 2023, 3, 26, 3, 0, 0, MappedLocalTime::Single(dst));
435
436        compare_lookup(&transitions, 2023, 10, 29, 1, 0, 0, MappedLocalTime::Single(dst));
437        compare_lookup(&transitions, 2023, 10, 29, 2, 0, 0, MappedLocalTime::Single(dst));
438        compare_lookup(&transitions, 2023, 10, 29, 2, 15, 0, MappedLocalTime::None);
439        compare_lookup(&transitions, 2023, 10, 29, 2, 30, 0, MappedLocalTime::Single(std));
440        compare_lookup(&transitions, 2023, 10, 29, 3, 0, 0, MappedLocalTime::Single(std));
441
442        // std transition before dst transition
443        // dst offset < std offset
444        let std = FixedOffset::east_opt(-(4 * 60 + 30) * 60).unwrap();
445        let dst = FixedOffset::east_opt(-5 * 60 * 60).unwrap();
446        let transitions = [
447            Transition::new(ymdhms(2023, 3, 24, 2, 0, 0), dst, std),
448            Transition::new(ymdhms(2023, 10, 27, 2, 30, 0), std, dst),
449        ];
450        compare_lookup(&transitions, 2023, 3, 24, 1, 0, 0, MappedLocalTime::Single(dst));
451        compare_lookup(&transitions, 2023, 3, 24, 2, 0, 0, MappedLocalTime::Single(dst));
452        compare_lookup(&transitions, 2023, 3, 24, 2, 15, 0, MappedLocalTime::None);
453        compare_lookup(&transitions, 2023, 3, 24, 2, 30, 0, MappedLocalTime::Single(std));
454        compare_lookup(&transitions, 2023, 3, 24, 3, 0, 0, MappedLocalTime::Single(std));
455
456        compare_lookup(&transitions, 2023, 10, 27, 1, 0, 0, MappedLocalTime::Single(std));
457        compare_lookup(&transitions, 2023, 10, 27, 2, 0, 0, MappedLocalTime::Ambiguous(std, dst));
458        compare_lookup(&transitions, 2023, 10, 27, 2, 15, 0, MappedLocalTime::Ambiguous(std, dst));
459        compare_lookup(&transitions, 2023, 10, 27, 2, 30, 0, MappedLocalTime::Ambiguous(std, dst));
460        compare_lookup(&transitions, 2023, 10, 27, 3, 0, 0, MappedLocalTime::Single(dst));
461
462        // offset stays the same
463        let std = FixedOffset::east_opt(3 * 60 * 60).unwrap();
464        let transitions = [
465            Transition::new(ymdhms(2023, 3, 26, 2, 0, 0), std, std),
466            Transition::new(ymdhms(2023, 10, 29, 3, 0, 0), std, std),
467        ];
468        compare_lookup(&transitions, 2023, 3, 26, 2, 0, 0, MappedLocalTime::Single(std));
469        compare_lookup(&transitions, 2023, 10, 29, 3, 0, 0, MappedLocalTime::Single(std));
470
471        // single transition
472        let std = FixedOffset::east_opt(3 * 60 * 60).unwrap();
473        let dst = FixedOffset::east_opt(4 * 60 * 60).unwrap();
474        let transitions = [Transition::new(ymdhms(2023, 3, 26, 2, 0, 0), std, dst)];
475        compare_lookup(&transitions, 2023, 3, 26, 1, 0, 0, MappedLocalTime::Single(std));
476        compare_lookup(&transitions, 2023, 3, 26, 2, 0, 0, MappedLocalTime::Single(std));
477        compare_lookup(&transitions, 2023, 3, 26, 2, 30, 0, MappedLocalTime::None);
478        compare_lookup(&transitions, 2023, 3, 26, 3, 0, 0, MappedLocalTime::Single(dst));
479        compare_lookup(&transitions, 2023, 3, 26, 4, 0, 0, MappedLocalTime::Single(dst));
480    }
481
482    #[test]
483    #[cfg(windows)]
484    fn test_lookup_with_dst_transitions_limits() {
485        // Transition beyond UTC year end doesn't panic in year of `NaiveDate::MAX`
486        let std = FixedOffset::east_opt(3 * 60 * 60).unwrap();
487        let dst = FixedOffset::east_opt(4 * 60 * 60).unwrap();
488        let transitions = [
489            Transition::new(NaiveDateTime::MAX.with_month(7).unwrap(), std, dst),
490            Transition::new(NaiveDateTime::MAX, dst, std),
491        ];
492        assert_eq!(
493            lookup_with_dst_transitions(&transitions, NaiveDateTime::MAX.with_month(3).unwrap()),
494            MappedLocalTime::Single(std)
495        );
496        assert_eq!(
497            lookup_with_dst_transitions(&transitions, NaiveDateTime::MAX.with_month(8).unwrap()),
498            MappedLocalTime::Single(dst)
499        );
500        // Doesn't panic with `NaiveDateTime::MAX` as argument (which would be out of range when
501        // converted to UTC).
502        assert_eq!(
503            lookup_with_dst_transitions(&transitions, NaiveDateTime::MAX),
504            MappedLocalTime::Ambiguous(dst, std)
505        );
506
507        // Transition before UTC year end doesn't panic in year of `NaiveDate::MIN`
508        let std = FixedOffset::west_opt(3 * 60 * 60).unwrap();
509        let dst = FixedOffset::west_opt(4 * 60 * 60).unwrap();
510        let transitions = [
511            Transition::new(NaiveDateTime::MIN, std, dst),
512            Transition::new(NaiveDateTime::MIN.with_month(6).unwrap(), dst, std),
513        ];
514        assert_eq!(
515            lookup_with_dst_transitions(&transitions, NaiveDateTime::MIN.with_month(3).unwrap()),
516            MappedLocalTime::Single(dst)
517        );
518        assert_eq!(
519            lookup_with_dst_transitions(&transitions, NaiveDateTime::MIN.with_month(8).unwrap()),
520            MappedLocalTime::Single(std)
521        );
522        // Doesn't panic with `NaiveDateTime::MIN` as argument (which would be out of range when
523        // converted to UTC).
524        assert_eq!(
525            lookup_with_dst_transitions(&transitions, NaiveDateTime::MIN),
526            MappedLocalTime::Ambiguous(std, dst)
527        );
528    }
529
530    #[test]
531    #[cfg(feature = "rkyv-validation")]
532    fn test_rkyv_validation() {
533        let local = Local;
534        // Local is a ZST and serializes to 0 bytes
535        let bytes = rkyv::to_bytes::<_, 0>(&local).unwrap();
536        assert_eq!(bytes.len(), 0);
537
538        // but is deserialized to an archived variant without a
539        // wrapping object
540        assert_eq!(rkyv::from_bytes::<Local>(&bytes).unwrap(), super::ArchivedLocal);
541    }
542}
chrono/offset/local/mod.rs

chrono/offset/local/
mod.rs
