Is there a database of time zones available for download?

Question

I searched and found a couple of web services that do this, but I was wondering if there is a public domain database that provides a list of latitudes and longitudes for standard time zone lines? I would like to be able to calculate which time zone is the coordinate, without using a web service. I figured that timezone boundaries are mostly static and probably decided by some committees, so there should be CSV or GPX or KML there.

I would like to be able to check what time zone the coordinate is in, for example:

48.856667 2.350833 - GMT + 1 or CET

Answer 1

This is a series of files - time zone polygons (shapefile) that you can transform into borders. With work on your part.

http://efele.net/maps/tz/world/ 

You should note that simply knowing TZ does not guarantee that you know anything about the current correct time or date there in terms of the local calendar. Time Ex: The Knesset Isreali (Parliament) decides when daylight hours begin and end - sometimes they chose a date in the past. Ex Date: The Hijri calendar changes months based on the ability of people in Mecca to actually observe the new moon. Cloud days change the date.

Answer 2

Askgeo.com has a Java library under a commercial license. (Scroll down the page to find information about this). They take 2 grants for him, although, given the amount of work that they had to put together in the assembly of vector cards, etc., I can understand that they want money.

I use their free API, but you wanted something downloadable, and I think this is one of your small bets.

Answer 3

I tried openstreetmap, and they have data, but it will be buried on a map of the Earth, and not completely useful itself. For example, on Wikipedia: http://en.wikipedia.org/wiki/List_of_tz_database_time_zones

Answer 4

I recently found this data here: https://github.com/straup/whereonearth-timezone