lat/lon to time offset database

Paul Koning paul_koning at
Thu Feb 3 21:53:29 UTC 2011

On Feb 3, 2011, at 4:43 PM, Jonathan Leffler wrote:

> On Thu, Feb 3, 2011 at 10:33, Larry Ober <larry.ober at> wrote:
> I don't really need the geo political information like country or city.
> However it seems like tz is structured continent/country/city/..
> As others have said, you do need the geo-political information.  And even that may not be sufficient.
> There's a region in China where some people use Beijing time and others use local time.  Search in the TZ mailing list archives for Xinjiang and Urumqi.  One email renewing the discussion was dated May 2010.  The rest of the discussion (under a different subject which I haven't located in my archive, mainly for not looking hard enough) pre-dates that.
> The upshot is though that even with a GPS database, you can't tell whether the wielder of the GPS-equipped system would prefer Beijing or Xinjiang time in that vicinity; it depends on who the wielder is.

True.  I think that that's a one of a kind case, though.


More information about the tz mailing list