[tz] TZ from lat/lon?

David Patte dpatte at relativedata.com
Fri Mar 2 02:58:53 UTC 2012

Time Zone Master, from relativedata.com, is a windows program that does 
this type of calculation internally. Of course there are limitations, 
since (especially in north america) very small areas can have differing 
zones than those around it. It uses a proprietary algorithm and open 
source databases to make a best-bet estimate of lat-lng to tz, and is 
quite good at it.

The programme is free from our site, and is packaged as a desktop clock 
application, but if you are looking for a more specific product for your 
needs, the internal latlong->tz engine could be rebuilt into something 
more suitable. Let me know what you are looking for.

On 2012-03-01 20:46, H J wrote:
> Hello all,
> Not sure if this is the best place to ask this (and if not, I would be very thankful for any suggestions), but does anyone know of a decent open source lat/lon-to-timezone package that runs _standalone_ (as opposed to querying a server somewhere)?
> I am aware of a few networked solutions (e.g. earthtools) and at least one commercial package (askgeo). The former won't work standalone, while the site license for the latter is too steep for my noncommercial, one-off project.
> Thanks very much in advance,
> HJ


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