<p dir="ltr">On Nov 14, 2013 3:33 AM, "dusan pecek" <<a href="mailto:dusan.pecek@gmail.com">dusan.pecek@gmail.com</a>> wrote:<br>
><br>
> Hi, not sure if this is the right place but I will ask anyhow.<br>
> I am interested in calculation of local time from lat, lon and UTC (ZULU).<br>
> It basically means that local time in the past can be calculated.<br>
> Does your database enable to do that.<br></p>
<p dir="ltr">I for one think this list is a fine place to ask that question.</p>
<p dir="ltr">The links I've seen others post in reply cover the answer, but to summarize, the zoneinfo database is necessary but not sufficient.</p>
<p dir="ltr">It documents the rules for timezone changes, including but not limited to summer time AKA "daylight savings" for regions that share a common rule. The key for lookups in this database is often of the form continent/city, e.g. I'm in America/New_York. Most rules have many keys.</p>
<p dir="ltr">But a separate database (and separate code) is needed to learn what rule covers (or contains) a given location as might be specified by latitude and longitude.</p>