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POConverting old and new local times to UTC under Windows XP/Server 2003
 

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    <p>My application converts past and present dates from local time to UTC.</p> <p>I need to ensure I will honor any future DST updates to Windows while still correctly handling past dates.</p> <p>The application is written in C++ and is running on Server 2003.</p> <p>Options I've researched:</p> <ul> <li><p><a href="http://msdn.microsoft.com/en-us/vstudio/bb264729.aspx" rel="nofollow noreferrer"><code>gmtime()</code> and <code>localtime()</code> are not always correct for past dates</a> because they will only ever observe current DST rules. (<a href="https://stackoverflow.com/questions/275952/has-the-daylight-savings-rule-change-invalidated-the-c-runtime-library">related SO question</a>)</p></li> <li><p>A <a href="https://stackoverflow.com/questions/237023/is-there-a-central-repository-for-time-zone-information">tz database</a> is out because it requires a separate manual update.</p></li> <li><p><a href="http://msdn.microsoft.com/en-us/library/bb540851%28VS.85%29.aspx" rel="nofollow noreferrer"><code>GetTimeZoneInformationForYear()</code></a> is out because it requires Vista/Server 2008. </p></li> <li><p><a href="http://74.125.47.132/search?q=cache:qInlsZFBRnYJ:www.experts-exchange.com/Programming/Languages/CPP/Q_23845887.html+GetTimeZoneInformationForYear&amp;cd=8&amp;hl=en&amp;ct=clnk&amp;gl=us&amp;client=firefox-a" rel="nofollow noreferrer">Past DST information is stored in the registry</a>, but I'm looking for something higher-level. </p></li> <li><p>Boost <a href="http://www.boost.org/doc/libs/1_37_0/doc/html/date_time.html" rel="nofollow noreferrer"><code>date_time</code></a>:</p> <ul> <li>class <a href="http://www.boost.org/doc/libs/1_37_0/boost/date_time/dst_rules.hpp" rel="nofollow noreferrer"><code>us_dst_rules</code></a> is deprecated and does not update if the OS updates.</li> <li>class <a href="http://www.boost.org/doc/libs/1_38_0/doc/html/boost/date_time/dst_calc_engine.html" rel="nofollow noreferrer"><code>dst_calc_engine&lt;></code></a> is its successor, but it does not respect OS updates either. </li> </ul></li> </ul> <p>So...</p> <ul> <li><p>... is anyone else using the raw registry solution to do this?</p></li> <li><p>... any other suggestions?</p></li> </ul> <p>(edit: found out <a href="http://www.boost.org/doc/libs/1_39_0/boost/date_time/local_timezone_defs.hpp" rel="nofollow noreferrer"><code>dst_calc_engine</code> doesn't support DST updates</a>)</p>
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