Jefferson County, Kentucky is now in America/Kentucky/Louisville.

Alaska is now handled properly, thanks information provided by Oscar van Vlijmen.

fixes to the polygons of America/Winnipeg, thanks to Veeder South.

fixed a small problem, thanks to Dan O’Neill.

added America/Sitka and America/Metlakatla.

Thanks to James Diebel for pointing out this problem.

extended America/Metlakatla to cover the whole of Annette island and a few nearby islands.

Thanks to Eric Michielli for reporting the problem.

some of the Aleutian islands were incorrectly in America/Adak rather than America/Nome.

I am not qualified to determine whether such rights exist. Note that this does not affect the rights others may have. This work is published from the United States of America. To the extent possible under law, Eric Muller has waived all copyright and related or neighboring rights to the /tz maps (comprising the shapefiles, the web pages describing them and the scripts and data used to build them). For the exact details of the assignments, see the script in the ingredients. The next step is to perform an overlay of the two maps, to progressively assign a tzid to the geometries (identified by a combination of state, county and “modern” timezone, in accordance with the description above), and to finally dissolve on the tzid attribute. Layer, the change was to replace the common boundaries by the dataįrom the County Boundaries. Zone boundary departs from a county boundary. Layer, the only change was to add intermediate points where a time Unfortunately, these two maps do not work well together: forĮxample, some common boundaries are not digitized in exactly the same Maps only captures the current time zones and does not include the the “County Boundaries, 2001” layer ( description,.The starting point is a couple of map layers from the National Atlas: The ingredients ( zip, sha1) contain a script to build the map, the modified sources. America/Boise: the part of Oregon legally in the Mountain Zone.America/North_Dakota/Beulah: North Dakota: Mercer county.America/North_Dakota/New_Salem: North Dakota: Morton county.America/North_Dakota/Center: North Dakota: Oliver county.America/Menominee: Dickinson, Gogebic, Iron and Menominee counties.America/Kentucky/Monticello: Wayne county.America/Kentucky/Louisville: Jefferson county.America/Indiana/Indianapolis: rest of Indiana.America/Chicago: Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer, Vanderburgh and Warrick counties.America/New_York: Dearborn and Ohio counties.America/Kentucky/Louisville: Clark, Floyd, and Harrison counties.America/Indiana/Vevay: Switzerland county.America/Indiana/Winamac: Pulaski county.America/Indiana/Petersburg: Pike county.

America/Indiana/Tell_City: Perry county.America/Indiana/Vincennes: Daviess, Dubois, Knox, and Martin counties.

America/Indiana/Marengo: Crawford county.America/Boise: the part of Idaho legally in the Mountain Zone.America/Phoenix: Arizona, less the Navajo lands.America/Nome: rest of Alaska, west of 162°.America/Anchrorage: rest of Alaska, east of 162°.America/Metlakatla: the Metlakatla reservation, understood to cover the whole of Annette island, as well as a few nearby islands.America/Sitka: Wrangell-Petersburg Census Area, Sitka City and Borough, Ketchikan Gateway Borough, an unidentified area at the south of Ketchikan, bordering Canada, Prince of Wales-Outer Ketchikan Census Area less Metlakatla.America/Juneau: Skagway-Hoonah-Angoon Census Area, Juneau City and Borough, Haines Borough.America/Yakutat: Yakutat City and Borough.America/Adak: Alaska, with timeznp020.symbol = HA.For example, the boundary between America/Los_Angeles and America/Denver follows the Nevada/Utah border in practice and by law since 1999, the city of West Wendover, Nevada, is part of America/Denver.Įxcept for the areas described below, the TZ timezone is determined from the legal timezone as follows: We do not attempt to record the boundaries at that level of detail. In general, towns on or near the boundary of a zone may practically follow the time of a neighboring zone. In the map, it is made of Jefferson county. TZ mentions that America/Kentucky/Louisville contains threeĬounties of Indiana and part of Kentucky, but does not describe precisely that part of Kentucky. The geometries are entirely derived from the countyp020p and timeznp020 shapefiles provided by the National Atlas.Īll the TZ timezones of United States listed in TZ’s zone.tab are represented, except for America/Shiprock which is included in America/Denver. The tz_us shapefile ( zip, sha1) captures the boundaries of the TZ timezones of the United States. A map of the TZ timezones of the US tz_us, an /tz map A shapefile of the TZ timezones of the United States This map is no longer maintained.

Time zones of america