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<title>std::chrono::get_tzdb_list, std::chrono::get_tzdb, std::chrono::remote_version, std::chrono::reload_tzdb</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::chrono::</span>get_tzdb_list, <span style="font-size:0.7em; line-height:130%">std::chrono::</span>get_tzdb, <span style="font-size:0.7em; line-height:130%">std::chrono::</span>remote_version, <span style="font-size:0.7em; line-height:130%">std::chrono::</span>reload_tzdb</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-chrono.html">chrono</a></span></div>
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<div><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">tzdb_list</span><span class="sy3">&amp;</span> get_tzdb_list<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(1)</td>
<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">tzdb</span><span class="sy3">&amp;</span> get_tzdb<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> remote_version<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(3)</td>
<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">tzdb</span><span class="sy3">&amp;</span> reload_tzdb<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(4)</td>
<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<p>&#36825;&#20123;&#20989;&#25968;&#25552;&#20379;&#21040;&#31243;&#24207;&#33539;&#22260;&#30340;&#26102;&#21306;&#25968;&#25454;&#24211;&#35775;&#38382;&#12290;</p>
<div class="t-li1"><span class="t-li">1)</span> &#36820;&#22238;&#21040;&#20840;&#23616; <span class="t-lc">std::chrono::tzdb_list</span> &#21333;&#20363;&#30340;&#24341;&#29992;&#12290;&#33509;&#36825;&#26159;&#21040;&#25968;&#25454;&#24211;&#30340;&#39318;&#27425;&#35775;&#38382;&#65292;&#21017;&#21021;&#22987;&#21270;&#25968;&#25454;&#24211;&#12290;&#21021;&#22987;&#21270;&#21518;&#65292;&#25968;&#25454;&#24211;&#23558;&#20445;&#26377;&#21333;&#20010;&#21021;&#22987;&#21270;&#30340; <span class="t-lc">std::chrono::tzdb</span> &#23545;&#35937; &#12290;&#27492;&#20989;&#25968;&#26159;&#32447;&#31243;&#23433;&#20840;&#30340;&#65306;&#21516;&#26102;&#35843;&#29992;&#27492;&#20989;&#25968;&#19981;&#24341;&#20837;&#25968;&#25454;&#31454;&#20105;&#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#36820;&#22238;&#21040; <code>tzdb_list</code> &#21333;&#20363;&#25152;&#20445;&#26377;&#30340;&#39318;&#20010; <span class="t-lc">std::chrono::tzdb</span> &#23545;&#35937;&#30340;&#24341;&#29992;&#12290;&#31561;&#20215;&#20110; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">get_tzdb_list</span><span class="br0">(</span><span class="br0">)</span>.<span class="me1">front</span><span class="br0">(</span><span class="br0">)</span></span></span> &#12290;</div>
<div class="t-li1"><span class="t-li">3)</span> &#36820;&#22238;&#21547;&#26377;&#26368;&#26032;&#36828;&#31243;&#25968;&#25454;&#24211;&#29256;&#26412;&#30340; string &#12290;</div>
<div class="t-li1"><span class="t-li">4)</span> &#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp">remote_version<span class="br0">(</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> get_tzdb<span class="br0">(</span><span class="br0">)</span>.<span class="me1">version</span></span></span> &#65292;&#21017;&#25512;&#20837;&#34920;&#31034;&#36828;&#31243;&#25968;&#25454;&#24211;&#30340;&#26032; <code>tzdb</code> &#23545;&#35937;&#21040; <code>get_tzdb_list()</code> &#25152;&#24341;&#29992;&#30340; <code>tzdb_list</code> &#21333;&#20363;&#30340;&#21069;&#37096;&#12290;&#21542;&#21017;&#26080;&#25928;&#26524;&#12290;&#19981;&#38750;&#27861;&#21270;&#20219;&#20309;&#24341;&#29992;&#12289;&#25351;&#38024;&#25110;&#36845;&#20195;&#22120;&#12290;&#21516;&#26102;&#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp">get_tzdb_list<span class="br0">(</span><span class="br0">)</span>.<span class="me1">front</span><span class="br0">(</span><span class="br0">)</span></span></span> &#25110; <span class="t-c"><span class="mw-geshi cpp source-cpp">get_tzdb_list<span class="br0">(</span><span class="br0">)</span>.<span class="me1">erase_after</span><span class="br0">(</span><span class="br0">)</span></span></span> &#35843;&#29992;&#27492;&#20989;&#25968;&#19981;&#24341;&#20837;&#25968;&#25454;&#31454;&#20105;&#12290;</div>
<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">&#24322;&#24120;</span></h3>
<div class="t-li1"><span class="t-li">1)</span> &#33509;&#22240;&#20219;&#20309;&#21407;&#22240;&#65292;&#21040; <code>tzdb_list</code> &#30340;&#24341;&#29992;&#21547;&#26377;&#19968;&#25110;&#22810;&#20010;&#19981;&#33021;&#36820;&#22238;&#30340; <code>tzdb</code> &#21017;&#20026; <span class="t-lc"><a href="cpp-error-runtime_error.html">std::runtime_error</a></span> &#12290;</div>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<div class="t-li1"><span class="t-li">1)</span> &#21040;&#20840;&#23616; <span class="t-lc">std::chrono::tzdb_list</span> &#21333;&#20363;&#30340;&#24341;&#29992;&#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">get_tzdb_list</span><span class="br0">(</span><span class="br0">)</span>.<span class="me1">front</span><span class="br0">(</span><span class="br0">)</span></span></span> &#12290;</div>
<div class="t-li1"><span class="t-li">3)</span> &#21547;&#26377;&#26368;&#26032;&#36828;&#31243;&#25968;&#25454;&#24211;&#29256;&#26412;&#30340; string &#12290;</div>
<div class="t-li1"><span class="t-li">4)</span> &#65288;&#27492;&#20989;&#25968;&#25152;&#20316;&#30340;&#20219;&#20309;&#26356;&#26032;&#21518;&#30340;&#65289; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">get_tzdb_list</span><span class="br0">(</span><span class="br0">)</span>.<span class="me1">front</span><span class="br0">(</span><span class="br0">)</span></span></span> &#12290;</div>
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