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<h1 class='fqn'><span class='in-band'>Struct <a href='../../index.html'>bitflags</a>::<wbr><a href='../index.html'>__core</a>::<wbr><a href='index.html'>time</a>::<wbr><a class='struct' href=''>SystemTime</a></span><span class='out-of-band'><span id='render-detail'>
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</span><a id='src-10766' class='srclink' href='https://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html?gotosrc=10766' title='goto source code'>[src]</a></span></h1>
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<pre class='rust struct'>pub struct SystemTime(_);</pre><span class="since">1.8.0</span><div class='docblock'><p>A measurement of the system clock, useful for talking to
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external entities like the file system or other processes.</p>
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<p>Distinct from the <code>Instant</code> type, this time measurement <strong>is not
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monotonic</strong>. This means that you can save a file to the file system, then
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save another file to the file system, <strong>and the second file has a
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<code>SystemTime</code> measurement earlier than the second</strong>. In other words, an
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operation that happens after another operation in real time may have an
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earlier <code>SystemTime</code>!</p>
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<p>Consequently, comparing two <code>SystemTime</code> instances to learn about the
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duration between them returns a <code>Result</code> instead of an infallible <code>Duration</code>
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to indicate that this sort of time drift may happen and needs to be handled.</p>
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<p>Although a <code>SystemTime</code> cannot be directly inspected, the <code>UNIX_EPOCH</code>
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constant is provided in this module as an anchor in time to learn
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information about a <code>SystemTime</code>. By calculating the duration from this
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fixed point in time, a <code>SystemTime</code> can be converted to a human-readable time,
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or perhaps some other string representation.</p>
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<p>Example:</p>
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<pre class='rust rust-example-rendered'>
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<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>time</span>::{<span class='ident'>Duration</span>, <span class='ident'>SystemTime</span>};
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<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>thread</span>::<span class='ident'>sleep</span>;
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<span class='kw'>fn</span> <span class='ident'>main</span>() {
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<span class='kw'>let</span> <span class='ident'>now</span> <span class='op'>=</span> <span class='ident'>SystemTime</span>::<span class='ident'>now</span>();
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<span class='comment'>// we sleep for 2 seconds</span>
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<span class='ident'>sleep</span>(<span class='ident'>Duration</span>::<span class='ident'>new</span>(<span class='number'>2</span>, <span class='number'>0</span>));
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<span class='kw'>match</span> <span class='ident'>now</span>.<span class='ident'>elapsed</span>() {
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<span class='prelude-val'>Ok</span>(<span class='ident'>elapsed</span>) <span class='op'>=></span> {
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<span class='comment'>// it prints '2'</span>
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<span class='macro'>println</span><span class='macro'>!</span>(<span class='string'>"{}"</span>, <span class='ident'>elapsed</span>.<span class='ident'>as_secs</span>());
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}
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<span class='prelude-val'>Err</span>(<span class='ident'>e</span>) <span class='op'>=></span> {
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<span class='comment'>// an error occured!</span>
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<span class='macro'>println</span><span class='macro'>!</span>(<span class='string'>"Error: {:?}"</span>, <span class='ident'>e</span>);
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}
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}
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