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reference/chrono/format.html

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<header data-kunai-mdinfo="{&#34;meta&#34;: {&#34;header&#34;: [&#34;chrono&#34;], &#34;namespace&#34;: [&#34;std&#34;], &#34;id-type&#34;: [&#34;function&#34;], &#34;cpp&#34;: [&#34;cpp20&#34;]}, &#34;sources&#34;: [{&#34;id&#34;: &#34;0f6d19b64fda7ebf3d72861db40f3878f09af47b&#34;, &#34;source&#34;: &#34;#include &lt;iostream&gt;\n#include &lt;format&gt;\n#include &lt;chrono&gt;\n\nint main()\n{\n auto now = std::chrono::system_clock::now(); // UTC\u6642\u9593\u306e\u73fe\u5728\u65e5\u6642\n\n // \u65e5\u4ed8\u3092\u51fa\u529b\n std::cout &lt;&lt; std::format(\&#34;1. {:%Y\u5e74%m\u6708%d\u65e5}\&#34;, now) &lt;&lt; std::endl;\n\n // \u6642\u9593\u3092\u51fa\u529b\u3002\n // \u79d2\u5358\u4f4d\u306etime_point\u306b\u5909\u63db\u3057\u306a\u3044\u3068\u3001\u5c0f\u6570\u70b9\u4ee5\u4e0b\u306e\u79d2\u3082\u51fa\u529b\u3055\u308c\u308b\n auto now_sec = std::chrono::time_point_cast&lt;std::chrono::seconds&gt;(now);\n std::cout &lt;&lt; std::format(\&#34;2. {:%H\u6642%M\u5206%S\u79d2}\&#34;, now) &lt;&lt; std::endl;\n std::cout &lt;&lt; std::format(\&#34;3. {:%H\u6642%M\u5206%S\u79d2}\&#34;, now_sec) &lt;&lt; std::endl;\n std::cout &lt;&lt; std::format(\&#34;4. {:%p %I\u6642%M\u5206%S\u79d2}\&#34;, now_sec) &lt;&lt; std::endl;\n std::cout &lt;&lt; std::format(\&#34;4. {:%p %I\u6642%M\u5206%S\u79d2}\&#34;, now_sec) &lt;&lt; std::endl;\n\n // \u305d\u306e\u4ed6\u8981\u7d20\n std::cout &lt;&lt; std::format(\&#34;6. {:%C}\&#34;, now) &lt;&lt; std::endl; // \u4e16\u7d00 (100\u3067\u5272\u3063\u3066\u5207\u308a\u4e0b\u3052\u305f\u5024)\n std::cout &lt;&lt; std::format(\&#34;7. {:%a}\&#34;, now) &lt;&lt; std::endl; // \u66dc\u65e5\u306e\u7565\u79f0\n std::cout &lt;&lt; std::format(\&#34;8. {:%A}\&#34;, now) &lt;&lt; std::endl; // \u66dc\u65e5\u306e\u5b8c\u5168\u540d\n}\n&#34;}], &#34;page_id&#34;: [&#34;reference&#34;, &#34;chrono&#34;, &#34;format&#34;]}">
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<header data-kunai-mdinfo="{&#34;meta&#34;: {&#34;header&#34;: [&#34;chrono&#34;], &#34;namespace&#34;: [&#34;std&#34;], &#34;id-type&#34;: [&#34;function&#34;], &#34;cpp&#34;: [&#34;cpp20&#34;]}, &#34;sources&#34;: [{&#34;id&#34;: &#34;55b21cfb890c1eea9bbda95fe3c3a906869d8ba8&#34;, &#34;source&#34;: &#34;#include &lt;iostream&gt;\n#include &lt;format&gt;\n#include &lt;chrono&gt;\n\nint main()\n{\n auto now = std::chrono::system_clock::now(); // UTC\u6642\u9593\u306e\u73fe\u5728\u65e5\u6642\n\n // \u65e5\u4ed8\u3092\u51fa\u529b\n std::cout &lt;&lt; std::format(\&#34;1. {:%Y\u5e74%m\u6708%d\u65e5}\&#34;, now) &lt;&lt; std::endl;\n\n // \u6642\u9593\u3092\u51fa\u529b\u3002\n // \u79d2\u5358\u4f4d\u306etime_point\u306b\u5909\u63db\u3057\u306a\u3044\u3068\u3001\u5c0f\u6570\u70b9\u4ee5\u4e0b\u306e\u79d2\u3082\u51fa\u529b\u3055\u308c\u308b\n auto now_sec = std::chrono::time_point_cast&lt;std::chrono::seconds&gt;(now);\n std::cout &lt;&lt; std::format(\&#34;2. {:%H\u6642%M\u5206%S\u79d2}\&#34;, now) &lt;&lt; std::endl;\n std::cout &lt;&lt; std::format(\&#34;3. {:%H\u6642%M\u5206%S\u79d2}\&#34;, now_sec) &lt;&lt; std::endl;\n std::cout &lt;&lt; std::format(\&#34;4. {:%p %I\u6642%M\u5206%S\u79d2}\&#34;, now_sec) &lt;&lt; std::endl;\n\n // \u305d\u306e\u4ed6\u8981\u7d20\n std::cout &lt;&lt; std::format(\&#34;5. {:%C}\&#34;, now) &lt;&lt; std::endl; // \u4e16\u7d00 (100\u3067\u5272\u3063\u3066\u5207\u308a\u4e0b\u3052\u305f\u5024)\n std::cout &lt;&lt; std::format(\&#34;6. {:%a}\&#34;, now) &lt;&lt; std::endl; // \u66dc\u65e5\u306e\u7565\u79f0\n std::cout &lt;&lt; std::format(\&#34;7. {:%A}\&#34;, now) &lt;&lt; std::endl; // \u66dc\u65e5\u306e\u5b8c\u5168\u540d\n}\n&#34;}], &#34;page_id&#34;: [&#34;reference&#34;, &#34;chrono&#34;, &#34;format&#34;]}">
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<nav class="navbar navbar-default" role="navigation">
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<div class="container-fluid">
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<div class="navbar-header">
@@ -188,12 +188,12 @@
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<p class="text-right"><small>
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最終更新日時(UTC):
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<span itemprop="datePublished" content="2024-09-24T08:40:08">
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2024年09月24日 08時40分08秒
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<span itemprop="datePublished" content="2025-06-14T08:37:52">
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2025年06月14日 08時37分52秒
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</span>
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<br/>
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<span itemprop="author" itemscope itemtype="http://schema.org/Person">
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<span itemprop="name">Akira Takahashi</span>
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<span itemprop="name">suomesta</span>
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</span>
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が更新
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</small></p>
@@ -316,12 +316,12 @@ <h3>chronoライブラリでのフォーマットフラグ</h3>
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</tr>
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<tr>
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<td><code>%H</code></td>
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<td>24時間時計での10進数の時。結果が1桁の場合、先頭に<code>0</code>がつく。改良コマンド<code>%OH</code>を指定知ると、ロケール依存の異なる表現を出力する</td>
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<td>24時間時計での10進数の時。結果が1桁の場合、先頭に<code>0</code>がつく。改良コマンド<code>%OH</code>を指定すると、ロケール依存の異なる表現を出力する</td>
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<td><code>"17"</code></td>
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</tr>
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<tr>
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<td><code>%I</code></td>
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<td>12時間時計での10進数の時。結果が1桁の場合、先頭に<code>0</code>がつく。改良コマンド<code>%OI</code>を指定知ると、ロケール依存の異なる表現を出力する</td>
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<td>12時間時計での10進数の時。結果が1桁の場合、先頭に<code>0</code>がつく。改良コマンド<code>%OI</code>を指定すると、ロケール依存の異なる表現を出力する</td>
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<td><code>"05"</code></td>
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</tr>
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<tr>
@@ -458,7 +458,7 @@ <h2><a class="cpprefjp-defined-word" data-desc="問題が発生したときに
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</li>
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</ul>
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<h2></h2>
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<p><div class="yata" id="0f6d19b64fda7ebf3d72861db40f3878f09af47b"><div class="codehilite"><pre><span></span><code><span class="cp">#include</span> <span class="cpf"><a href="../iostream.html">&lt;iostream&gt;</a></span><span class="cp"></span>
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<p><div class="yata" id="55b21cfb890c1eea9bbda95fe3c3a906869d8ba8"><div class="codehilite"><pre><span></span><code><span class="cp">#include</span> <span class="cpf"><a href="../iostream.html">&lt;iostream&gt;</a></span><span class="cp"></span>
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<span class="cp">#include</span> <span class="cpf"><a href="../format.html">&lt;format&gt;</a></span><span class="cp"></span>
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<span class="cp">#include</span> <span class="cpf"><a href="../chrono.html">&lt;chrono&gt;</a></span><span class="cp"></span>
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@@ -475,12 +475,11 @@ <h2>例</h2>
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<span class="n"><a href="../iostream/cout.html">std::cout</a></span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">format</span><span class="p">(</span><span class="s">"2. {:%H時%M分%S秒}"</span><span class="p">,</span> <span class="n">now</span><span class="p">)</span> <span class="o">&lt;&lt;</span> <span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
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<span class="n"><a href="../iostream/cout.html">std::cout</a></span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">format</span><span class="p">(</span><span class="s">"3. {:%H時%M分%S秒}"</span><span class="p">,</span> <span class="n">now_sec</span><span class="p">)</span> <span class="o">&lt;&lt;</span> <span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
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<span class="n"><a href="../iostream/cout.html">std::cout</a></span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">format</span><span class="p">(</span><span class="s">"4. {:%p %I時%M分%S秒}"</span><span class="p">,</span> <span class="n">now_sec</span><span class="p">)</span> <span class="o">&lt;&lt;</span> <span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
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<span class="n"><a href="../iostream/cout.html">std::cout</a></span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">format</span><span class="p">(</span><span class="s">"4. {:%p %I時%M分%S秒}"</span><span class="p">,</span> <span class="n">now_sec</span><span class="p">)</span> <span class="o">&lt;&lt;</span> <span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
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<span class="c1">// その他要素</span>
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<span class="n"><a href="../iostream/cout.html">std::cout</a></span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">format</span><span class="p">(</span><span class="s">"6. {:%C}"</span><span class="p">,</span> <span class="n">now</span><span class="p">)</span> <span class="o">&lt;&lt;</span> <span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span> <span class="c1">// 世紀 (100で割って切り下げた値)</span>
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<span class="n"><a href="../iostream/cout.html">std::cout</a></span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">format</span><span class="p">(</span><span class="s">"7. {:%a}"</span><span class="p">,</span> <span class="n">now</span><span class="p">)</span> <span class="o">&lt;&lt;</span> <span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span> <span class="c1">// 曜日の略称</span>
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<span class="n"><a href="../iostream/cout.html">std::cout</a></span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">format</span><span class="p">(</span><span class="s">"8. {:%A}"</span><span class="p">,</span> <span class="n">now</span><span class="p">)</span> <span class="o">&lt;&lt;</span> <span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span> <span class="c1">// 曜日の完全名</span>
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<span class="n"><a href="../iostream/cout.html">std::cout</a></span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">format</span><span class="p">(</span><span class="s">"5. {:%C}"</span><span class="p">,</span> <span class="n">now</span><span class="p">)</span> <span class="o">&lt;&lt;</span> <span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span> <span class="c1">// 世紀 (100で割って切り下げた値)</span>
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<span class="n"><a href="../iostream/cout.html">std::cout</a></span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">format</span><span class="p">(</span><span class="s">"6. {:%a}"</span><span class="p">,</span> <span class="n">now</span><span class="p">)</span> <span class="o">&lt;&lt;</span> <span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span> <span class="c1">// 曜日の略称</span>
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<span class="n"><a href="../iostream/cout.html">std::cout</a></span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">format</span><span class="p">(</span><span class="s">"7. {:%A}"</span><span class="p">,</span> <span class="n">now</span><span class="p">)</span> <span class="o">&lt;&lt;</span> <span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span> <span class="c1">// 曜日の完全名</span>
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<span class="p">}</span>
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</code></pre></div>
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</div></p>
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2. 08時27分28.1822610秒
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3. 08時27分28秒
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4. AM 08時27分28秒
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</code></pre></p>
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<h2>バージョン</h2>
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<h3>言語</h3>

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