On Thu, 25 Oct 2007 16:43:05 -0700,
James Walker (email@hidden) wrote:
>Is there any API to map a location specified by latitude and longitude
>to a time zone name or CFTimeZoneRef? The Date & Time preference panel
>apparently knows how to do that, since you can click a point on a map to
>select a time zone.
I don't know about specific APIs, but I imagine you could
get a very rough estimate by looking up the closest coordinates [*]
in /usr/share/zoneinfo/zone.tab, and feed the resulting time
zone name to CFTimeZoneCreateWithName() (or +[NSTimeZone timeZoneWithName:]).
[*] Possibly using the Haversine Formula:
<http://www.movable-type.co.uk/scripts/gis-faq-5.1.html>
Or perhaps, if you need better precision, you could use a web
service such as:
<http://www.earthtools.org/webservices.htm#timezone>
-- marco
--
It's not the data universe only, it's human conversation.
They want to turn it into a one-way flow that they have entirely
monetized. I look at the collective human mind as a kind of
ecosystem. They want to clear cut it. They want to go into the
rainforest of human thought and mow the thing down.
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