64 lines
3.4 KiB
HTML
64 lines
3.4 KiB
HTML
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<title>std::chrono::system_clock::from_time_t</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_chrono_system_clock_from_time_t skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::chrono::system_clock::</span>from_time_t</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-chrono.html">chrono</a>‎ | <a href="cpp-chrono-system_clock.html">system clock</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">static</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">system_clock</span><span class="sy4">::</span><span class="me2">time_point</span> from_time_t<span class="br0">(</span> <a href="cpp-chrono-c-time_t.html"><span class="kw1024">std::<span class="me2">time_t</span></span></a> t <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<p>用二个类型间的较低精度，转换 <code>t</code> 为时间点类型。</p>
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<p>若 <code>time_point</code> 拥有较低精度，则舍入还是截断值是实现定义的。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<td>t</td>
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<td>-</td>
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<td>要转换的 <span class="t-lc"><a href="cpp-chrono-c-time_t.html">std::time_t</a></span> 值</td>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
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<p>表示 <code>t</code> 的 <span class="t-lc">std::chrono::system_clock::time_point</span> 类型值。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<div><a href="cpp-chrono-system_clock-to_time_t.html"><span class="t-lines"><span>to_time_t</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-cmark">[静态]</span></span></span></div>
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<td>转换系统时钟时间点为 <span class="t-lc"><a href="cpp-chrono-c-time_t.html">std::time_t</a></span><br />
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<span class="t-mark">(公开静态成员函数)</span></td>
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