On 01/10/2010 17:14, andrzej zaborowski wrote:
On 1 October 2010 18:12, andrzej zaborowski<[email protected]> wrote:
Checking if a point is inside a polygons is trivial, but is it what
they really want? Wouldn't just the longitude tell you the time
better than the timezone?
E.g. offset_from_gmt = ((lon - 180) / 15) hours
oops, rather (lon / 15) hours
Timezone boundaries do not exactly follow lines of longitude (Google
finds a nice map here: http://www.travel.com.hk/region/timezone.htm).
Also there are some places where the civil time is offset from UTC by
some hours and a half-hour and even some places where the offset has +/-
15 minutes in it (Nepal is UTC+5 3/4).
--
David James
[email protected]
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