Uttarayan Mondal
207 lines
16 KiB
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207 lines
16 KiB
HTML
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</pre><div class="example-wrap"><pre class="rust ">
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<span class="comment">// This is a part of Chrono.</span>
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<span class="comment">// See README.md and LICENSE.txt for details.</span>
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<span class="doccomment">//! The UTC (Coordinated Universal Time) time zone.</span>
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<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">fmt</span>;
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<span class="kw">use</span> <span class="kw">super</span>::{<span class="ident">FixedOffset</span>, <span class="ident">LocalResult</span>, <span class="ident">Offset</span>, <span class="ident">TimeZone</span>};
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<span class="kw">use</span> <span class="ident">naive</span>::{<span class="ident">NaiveDate</span>, <span class="ident">NaiveDateTime</span>};
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<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(
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<span class="ident">feature</span> <span class="op">=</span> <span class="string">"clock"</span>,
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<span class="ident">not</span>(<span class="ident">all</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"wasm32"</span>, <span class="ident">not</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"wasi"</span>), <span class="ident">feature</span> <span class="op">=</span> <span class="string">"wasmbind"</span>))
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))]</span>
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">time</span>::{<span class="ident">SystemTime</span>, <span class="ident">UNIX_EPOCH</span>};
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<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"clock"</span>)]</span>
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<span class="kw">use</span> {<span class="ident">Date</span>, <span class="ident">DateTime</span>};
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<span class="doccomment">/// The UTC time zone. This is the most efficient time zone when you don't need the local time.</span>
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<span class="doccomment">/// It is also used as an offset (which is also a dummy type).</span>
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<span class="doccomment">///</span>
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<span class="doccomment">/// Using the [`TimeZone`](./trait.TimeZone.html) methods</span>
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<span class="doccomment">/// on the UTC struct is the preferred way to construct `DateTime<Utc>`</span>
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<span class="doccomment">/// instances.</span>
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<span class="doccomment">///</span>
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<span class="doccomment">/// # Example</span>
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<span class="doccomment">///</span>
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<span class="doccomment">/// ~~~~</span>
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<span class="doccomment">/// use chrono::{DateTime, TimeZone, NaiveDateTime, Utc};</span>
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<span class="doccomment">///</span>
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<span class="doccomment">/// let dt = DateTime::<Utc>::from_utc(NaiveDateTime::from_timestamp(61, 0), Utc);</span>
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<span class="doccomment">///</span>
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<span class="doccomment">/// assert_eq!(Utc.timestamp(61, 0), dt);</span>
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<span class="doccomment">/// assert_eq!(Utc.ymd(1970, 1, 1).and_hms(0, 1, 1), dt);</span>
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<span class="doccomment">/// ~~~~</span>
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<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Copy</span>, <span class="ident">Clone</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>)]</span>
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<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Utc</span>;
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<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"clock"</span>)]</span>
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<span class="kw">impl</span> <span class="ident">Utc</span> {
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<span class="doccomment">/// Returns a `Date` which corresponds to the current date.</span>
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<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">today</span>() <span class="op">-</span><span class="op">></span> <span class="ident">Date</span><span class="op"><</span><span class="ident">Utc</span><span class="op">></span> {
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<span class="ident">Utc</span>::<span class="ident">now</span>().<span class="ident">date</span>()
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}
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<span class="doccomment">/// Returns a `DateTime` which corresponds to the current date.</span>
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<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">all</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"wasm32"</span>, <span class="ident">not</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"wasi"</span>), <span class="ident">feature</span> <span class="op">=</span> <span class="string">"wasmbind"</span>)))]</span>
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<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">now</span>() <span class="op">-</span><span class="op">></span> <span class="ident">DateTime</span><span class="op"><</span><span class="ident">Utc</span><span class="op">></span> {
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<span class="kw">let</span> <span class="ident">now</span> <span class="op">=</span>
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<span class="ident">SystemTime</span>::<span class="ident">now</span>().<span class="ident">duration_since</span>(<span class="ident">UNIX_EPOCH</span>).<span class="ident">expect</span>(<span class="string">"system time before Unix epoch"</span>);
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<span class="kw">let</span> <span class="ident">naive</span> <span class="op">=</span> <span class="ident">NaiveDateTime</span>::<span class="ident">from_timestamp</span>(<span class="ident">now</span>.<span class="ident">as_secs</span>() <span class="kw">as</span> <span class="ident">i64</span>, <span class="ident">now</span>.<span class="ident">subsec_nanos</span>() <span class="kw">as</span> <span class="ident">u32</span>);
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<span class="ident">DateTime</span>::<span class="ident">from_utc</span>(<span class="ident">naive</span>, <span class="ident">Utc</span>)
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}
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<span class="doccomment">/// Returns a `DateTime` which corresponds to the current date.</span>
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<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"wasm32"</span>, <span class="ident">not</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"wasi"</span>), <span class="ident">feature</span> <span class="op">=</span> <span class="string">"wasmbind"</span>))]</span>
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<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">now</span>() <span class="op">-</span><span class="op">></span> <span class="ident">DateTime</span><span class="op"><</span><span class="ident">Utc</span><span class="op">></span> {
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<span class="kw">let</span> <span class="ident">now</span> <span class="op">=</span> <span class="ident">js_sys</span>::<span class="ident">Date</span>::<span class="ident">new_0</span>();
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<span class="ident">DateTime</span>::<span class="op"><</span><span class="ident">Utc</span><span class="op">></span>::<span class="ident">from</span>(<span class="ident">now</span>)
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}
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}
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<span class="kw">impl</span> <span class="ident">TimeZone</span> <span class="kw">for</span> <span class="ident">Utc</span> {
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<span class="kw">type</span> <span class="ident">Offset</span> <span class="op">=</span> <span class="ident">Utc</span>;
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<span class="kw">fn</span> <span class="ident">from_offset</span>(<span class="ident">_state</span>: <span class="kw-2">&</span><span class="ident">Utc</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Utc</span> {
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<span class="ident">Utc</span>
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}
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<span class="kw">fn</span> <span class="ident">offset_from_local_date</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">_local</span>: <span class="kw-2">&</span><span class="ident">NaiveDate</span>) <span class="op">-</span><span class="op">></span> <span class="ident">LocalResult</span><span class="op"><</span><span class="ident">Utc</span><span class="op">></span> {
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<span class="ident">LocalResult</span>::<span class="ident">Single</span>(<span class="ident">Utc</span>)
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}
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<span class="kw">fn</span> <span class="ident">offset_from_local_datetime</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">_local</span>: <span class="kw-2">&</span><span class="ident">NaiveDateTime</span>) <span class="op">-</span><span class="op">></span> <span class="ident">LocalResult</span><span class="op"><</span><span class="ident">Utc</span><span class="op">></span> {
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<span class="ident">LocalResult</span>::<span class="ident">Single</span>(<span class="ident">Utc</span>)
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}
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<span class="kw">fn</span> <span class="ident">offset_from_utc_date</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">_utc</span>: <span class="kw-2">&</span><span class="ident">NaiveDate</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Utc</span> {
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<span class="ident">Utc</span>
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}
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<span class="kw">fn</span> <span class="ident">offset_from_utc_datetime</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">_utc</span>: <span class="kw-2">&</span><span class="ident">NaiveDateTime</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Utc</span> {
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<span class="ident">Utc</span>
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}
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}
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<span class="kw">impl</span> <span class="ident">Offset</span> <span class="kw">for</span> <span class="ident">Utc</span> {
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<span class="kw">fn</span> <span class="ident">fix</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">FixedOffset</span> {
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<span class="ident">FixedOffset</span>::<span class="ident">east</span>(<span class="number">0</span>)
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}
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}
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<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Utc</span> {
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<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-</span><span class="op">></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
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<span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Z"</span>)
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}
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}
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<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">Utc</span> {
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<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-</span><span class="op">></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
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<span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"UTC"</span>)
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}
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}
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</pre></div>
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