![]() 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/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. Indiana introduced DST in 2006.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map of the TZ timezones of the US tz_us, an /tz map A shapefile of the TZ timezones of the United States This map is no longer maintained. Most of Arizona and Hawaii don't use DST. In addition the uninhabited atolls of Baker Island (AoE) and Wake Island (WAKT) add to the time zone count, making 11 the total number of time zones in the US.Īlmost all states in the US use Daylight Saving Time (DST). There are 9 official time zones according to the law. The time zones in the law are defined by their offset from Coordinated Universal Time (UTC). Code, Title 15, Chapter 6, Subchapter IX - Standard Time. Time zones in the USA are defined in the U.S. Since 1967, the US Department of Transportation (DOT) has been responsible for governing time zones in the country. The US was divided into 4 standard time zones on November 18, 1883, and jurisdiction for the zones was given to the Interstate Commerce Commission (ICC). Time Zones Being Used in Dependencies of United States Offset They will become active again after the next clock change as Daylight Saving Time begins or ends. The above time zones are used during other parts of the year. Time Zones Not Currently Being Observed in United States Offset ![]() Note: Local time in these time zones changes when Daylight Saving Time begins and ends. In practice, this means that the local time in these time zones changes when DST begins and ends. For example, Eastern Time (ET) refers to Eastern Standard Time (EST) or Eastern Daylight Time (EDT), depending on which is currently in use. The time zones in the contiguous US are often referred to by their generic name, without making a difference between standard time and Daylight Saving Time designations. Generalized Time Zones in United States Time Zone Abbreviation & Name Since Howland Island and Baker Island constitute the world's westernmost landmasses in relation to the International Date Line, making them the last places on Earth where any date exists, they are sometimes assigned a theoretical 12th time zone called Anywhere on Earth (AoE). As neither Hawaii nor the 5 dependencies use Daylight Saving Time (DST), there are only 6 corresponding DST time zones. In addition, Alaska, Hawaii, and 5 US dependencies all have their own time zones. The contiguous US has 4 standard time zones. However, adding the time zones of 2 uninhabited US territories, Howland Island and Baker Island, brings the total count to 11 time zones. There are 9 time zones by law in the USA and its dependencies. Time Zones Currently Being Used in United States Offset
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