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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">//! The local (system) time zone.
</span><span class="attr">#[cfg(feature = <span class="string">"rkyv"</span>)]
</span><span class="kw">use </span>rkyv::{Archive, Deserialize, Serialize};
<span class="kw">use </span><span class="kw">super</span>::fixed::FixedOffset;
<span class="kw">use super</span>::{LocalResult, TimeZone};
<span class="kw">use </span><span class="kw">crate</span>::naive::{NaiveDate, NaiveDateTime, NaiveTime};
<span class="attr">#[allow(deprecated)]
</span><span class="kw">use </span><span class="kw">crate</span>::Date;
<span class="kw">use crate</span>::{DateTime, Utc};
<span class="attr">#[cfg(unix)]
#[path = <span class="string">"unix.rs"</span>]
</span><span class="kw">mod </span>inner;
<span class="attr">#[cfg(windows)]
#[path = <span class="string">"windows.rs"</span>]
</span><span class="kw">mod </span>inner;
<span class="attr">#[cfg(all(windows, feature = <span class="string">"clock"</span>))]
#[allow(unreachable_pub)]
</span><span class="kw">mod </span>win_bindings;
<span class="attr">#[cfg(all(
not(unix),
not(windows),
not(all(
target_arch = <span class="string">"wasm32"</span>,
feature = <span class="string">"wasmbind"</span>,
not(any(target_os = <span class="string">"emscripten"</span>, target_os = <span class="string">"wasi"</span>))
))
))]
</span><span class="kw">mod </span>inner {
<span class="kw">use crate</span>::{FixedOffset, LocalResult, NaiveDateTime};
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>offset_from_utc_datetime(_utc_time: <span class="kw-2">&</span>NaiveDateTime) -> LocalResult<FixedOffset> {
LocalResult::Single(FixedOffset::east_opt(<span class="number">0</span>).unwrap())
}
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>offset_from_local_datetime(
_local_time: <span class="kw-2">&</span>NaiveDateTime,
) -> LocalResult<FixedOffset> {
LocalResult::Single(FixedOffset::east_opt(<span class="number">0</span>).unwrap())
}
}
<span class="attr">#[cfg(all(
target_arch = <span class="string">"wasm32"</span>,
feature = <span class="string">"wasmbind"</span>,
not(any(target_os = <span class="string">"emscripten"</span>, target_os = <span class="string">"wasi"</span>))
))]
</span><span class="kw">mod </span>inner {
<span class="kw">use crate</span>::{Datelike, FixedOffset, LocalResult, NaiveDateTime, Timelike};
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>offset_from_utc_datetime(utc: <span class="kw-2">&</span>NaiveDateTime) -> LocalResult<FixedOffset> {
<span class="kw">let </span>offset = js_sys::Date::from(utc.and_utc()).get_timezone_offset();
LocalResult::Single(FixedOffset::west_opt((offset <span class="kw">as </span>i32) * <span class="number">60</span>).unwrap())
}
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>offset_from_local_datetime(local: <span class="kw-2">&</span>NaiveDateTime) -> LocalResult<FixedOffset> {
<span class="kw">let </span><span class="kw-2">mut </span>year = local.year();
<span class="kw">if </span>year < <span class="number">100 </span>{
<span class="comment">// The API in `js_sys` does not let us create a `Date` with negative years.
// And values for years from `0` to `99` map to the years `1900` to `1999`.
// Shift the value by a multiple of 400 years until it is `>= 100`.
</span><span class="kw">let </span>shift_cycles = (year - <span class="number">100</span>).div_euclid(<span class="number">400</span>);
year -= shift_cycles * <span class="number">400</span>;
}
<span class="kw">let </span>js_date = js_sys::Date::new_with_year_month_day_hr_min_sec(
year <span class="kw">as </span>u32,
local.month0() <span class="kw">as </span>i32,
local.day() <span class="kw">as </span>i32,
local.hour() <span class="kw">as </span>i32,
local.minute() <span class="kw">as </span>i32,
local.second() <span class="kw">as </span>i32,
<span class="comment">// ignore milliseconds, our representation of leap seconds may be problematic
</span>);
<span class="kw">let </span>offset = js_date.get_timezone_offset();
<span class="comment">// We always get a result, even if this time does not exist or is ambiguous.
</span>LocalResult::Single(FixedOffset::west_opt((offset <span class="kw">as </span>i32) * <span class="number">60</span>).unwrap())
}
}
<span class="attr">#[cfg(unix)]
</span><span class="kw">mod </span>tz_info;
<span class="doccomment">/// The local timescale. This is implemented via the standard `time` crate.
///
/// Using the [`TimeZone`](./trait.TimeZone.html) methods
/// on the Local struct is the preferred way to construct `DateTime<Local>`
/// instances.
///
/// # Example
///
/// ```
/// use chrono::{Local, DateTime, TimeZone};
///
/// let dt1: DateTime<Local> = Local::now();
/// let dt2: DateTime<Local> = Local.timestamp_opt(0, 0).unwrap();
/// assert!(dt1 >= dt2);
/// ```
</span><span class="attr">#[derive(Copy, Clone, Debug)]
#[cfg_attr(feature = <span class="string">"rkyv"</span>, derive(Archive, Deserialize, Serialize))]
#[cfg_attr(feature = <span class="string">"arbitrary"</span>, derive(arbitrary::Arbitrary))]
</span><span class="kw">pub struct </span>Local;
<span class="kw">impl </span>Local {
<span class="doccomment">/// Returns a `Date` which corresponds to the current date.
</span><span class="attr">#[deprecated(since = <span class="string">"0.4.23"</span>, note = <span class="string">"use `Local::now()` instead"</span>)]
#[allow(deprecated)]
#[must_use]
</span><span class="kw">pub fn </span>today() -> Date<Local> {
Local::now().date()
}
<span class="doccomment">/// Returns a `DateTime<Local>` which corresponds to the current date, time and offset from
/// UTC.
///
/// See also the similar [`Utc::now()`] which returns `DateTime<Utc>`, i.e. without the local
/// offset.
///
/// # Example
///
/// ```
/// # #![allow(unused_variables)]
/// # use chrono::{DateTime, FixedOffset, Local};
/// // Current local time
/// let now = Local::now();
///
/// // Current local date
/// let today = now.date_naive();
///
/// // Current local time, converted to `DateTime<FixedOffset>`
/// let now_fixed_offset = Local::now().fixed_offset();
/// // or
/// let now_fixed_offset: DateTime<FixedOffset> = Local::now().into();
///
/// // Current time in some timezone (let's use +05:00)
/// // Note that it is usually more efficient to use `Utc::now` for this use case.
/// let offset = FixedOffset::east_opt(5 * 60 * 60).unwrap();
/// let now_with_offset = Local::now().with_timezone(&offset);
/// ```
</span><span class="kw">pub fn </span>now() -> DateTime<Local> {
Utc::now().with_timezone(<span class="kw-2">&</span>Local)
}
}
<span class="kw">impl </span>TimeZone <span class="kw">for </span>Local {
<span class="kw">type </span>Offset = FixedOffset;
<span class="kw">fn </span>from_offset(_offset: <span class="kw-2">&</span>FixedOffset) -> Local {
Local
}
<span class="attr">#[allow(deprecated)]
</span><span class="kw">fn </span>offset_from_local_date(<span class="kw-2">&</span><span class="self">self</span>, local: <span class="kw-2">&</span>NaiveDate) -> LocalResult<FixedOffset> {
<span class="comment">// Get the offset at local midnight.
</span><span class="self">self</span>.offset_from_local_datetime(<span class="kw-2">&</span>local.and_time(NaiveTime::MIN))
}
<span class="kw">fn </span>offset_from_local_datetime(<span class="kw-2">&</span><span class="self">self</span>, local: <span class="kw-2">&</span>NaiveDateTime) -> LocalResult<FixedOffset> {
inner::offset_from_local_datetime(local)
}
<span class="attr">#[allow(deprecated)]
</span><span class="kw">fn </span>offset_from_utc_date(<span class="kw-2">&</span><span class="self">self</span>, utc: <span class="kw-2">&</span>NaiveDate) -> FixedOffset {
<span class="comment">// Get the offset at midnight.
</span><span class="self">self</span>.offset_from_utc_datetime(<span class="kw-2">&</span>utc.and_time(NaiveTime::MIN))
}
<span class="kw">fn </span>offset_from_utc_datetime(<span class="kw-2">&</span><span class="self">self</span>, utc: <span class="kw-2">&</span>NaiveDateTime) -> FixedOffset {
inner::offset_from_utc_datetime(utc).unwrap()
}
}
<span class="attr">#[cfg(test)]
</span><span class="kw">mod </span>tests {
<span class="kw">use </span><span class="kw">super</span>::Local;
<span class="kw">use </span><span class="kw">crate</span>::offset::TimeZone;
<span class="kw">use crate</span>::{Datelike, Duration, Utc};
<span class="attr">#[test]
</span><span class="kw">fn </span>verify_correct_offsets() {
<span class="kw">let </span>now = Local::now();
<span class="kw">let </span>from_local = Local.from_local_datetime(<span class="kw-2">&</span>now.naive_local()).unwrap();
<span class="kw">let </span>from_utc = Local.from_utc_datetime(<span class="kw-2">&</span>now.naive_utc());
<span class="macro">assert_eq!</span>(now.offset().local_minus_utc(), from_local.offset().local_minus_utc());
<span class="macro">assert_eq!</span>(now.offset().local_minus_utc(), from_utc.offset().local_minus_utc());
<span class="macro">assert_eq!</span>(now, from_local);
<span class="macro">assert_eq!</span>(now, from_utc);
}
<span class="attr">#[test]
</span><span class="kw">fn </span>verify_correct_offsets_distant_past() {
<span class="comment">// let distant_past = Local::now() - Duration::days(365 * 100);
</span><span class="kw">let </span>distant_past = Local::now() - Duration::days(<span class="number">250 </span>* <span class="number">31</span>);
<span class="kw">let </span>from_local = Local.from_local_datetime(<span class="kw-2">&</span>distant_past.naive_local()).unwrap();
<span class="kw">let </span>from_utc = Local.from_utc_datetime(<span class="kw-2">&</span>distant_past.naive_utc());
<span class="macro">assert_eq!</span>(distant_past.offset().local_minus_utc(), from_local.offset().local_minus_utc());
<span class="macro">assert_eq!</span>(distant_past.offset().local_minus_utc(), from_utc.offset().local_minus_utc());
<span class="macro">assert_eq!</span>(distant_past, from_local);
<span class="macro">assert_eq!</span>(distant_past, from_utc);
}
<span class="attr">#[test]
</span><span class="kw">fn </span>verify_correct_offsets_distant_future() {
<span class="kw">let </span>distant_future = Local::now() + Duration::days(<span class="number">250 </span>* <span class="number">31</span>);
<span class="kw">let </span>from_local = Local.from_local_datetime(<span class="kw-2">&</span>distant_future.naive_local()).unwrap();
<span class="kw">let </span>from_utc = Local.from_utc_datetime(<span class="kw-2">&</span>distant_future.naive_utc());
<span class="macro">assert_eq!</span>(
distant_future.offset().local_minus_utc(),
from_local.offset().local_minus_utc()
);
<span class="macro">assert_eq!</span>(distant_future.offset().local_minus_utc(), from_utc.offset().local_minus_utc());
<span class="macro">assert_eq!</span>(distant_future, from_local);
<span class="macro">assert_eq!</span>(distant_future, from_utc);
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_local_date_sanity_check() {
<span class="comment">// issue #27
</span><span class="macro">assert_eq!</span>(Local.with_ymd_and_hms(<span class="number">2999</span>, <span class="number">12</span>, <span class="number">28</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>).unwrap().day(), <span class="number">28</span>);
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_leap_second() {
<span class="comment">// issue #123
</span><span class="kw">let </span>today = Utc::now().date_naive();
<span class="kw">if let </span><span class="prelude-val">Some</span>(dt) = today.and_hms_milli_opt(<span class="number">15</span>, <span class="number">2</span>, <span class="number">59</span>, <span class="number">1000</span>) {
<span class="kw">let </span>timestr = dt.time().to_string();
<span class="comment">// the OS API may or may not support the leap second,
// but there are only two sensible options.
</span><span class="macro">assert!</span>(
timestr == <span class="string">"15:02:60" </span>|| timestr == <span class="string">"15:03:00"</span>,
<span class="string">"unexpected timestr {:?}"</span>,
timestr
);
}
<span class="kw">if let </span><span class="prelude-val">Some</span>(dt) = today.and_hms_milli_opt(<span class="number">15</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">1234</span>) {
<span class="kw">let </span>timestr = dt.time().to_string();
<span class="macro">assert!</span>(
timestr == <span class="string">"15:02:03.234" </span>|| timestr == <span class="string">"15:02:04.234"</span>,
<span class="string">"unexpected timestr {:?}"</span>,
timestr
);
}
}
}
</code></pre></div>
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