![]() Plus the lines aren’t even as clean as suggested. However it’s still a fun set of circumstances to ponder. In reality our traveler wouldn’t actually change his watch four times along this 90 mile route. Our fictional traveler would start in DST (Jeddito, Navajo exclave), switch to standard time (Hopi), switch to DST (Navajo), switch to standard time (Moenkopi, Hopi exclave) and switch to DST (Navajo) at Tuba City. Imagine someone traveling from Jeddito on Route 264 to Tuba City during the summer. All is fine during the winter months when everyone observes Mountain Standard Time but it spirals into confusion when DST kicks-in. The Navajo Nation recognizes daylight saving time (DST). ![]() ![]() A major Navajo town with more than 8,000 inhabitants, Tuba City, sits just above Moenkopi north of the intersection of Routes 160 and 264. Likewise the Hopi Nation also has an exclave, Moenkopi, within the Navajo Nation. The Navajo Nation has an exclave, Jeddito, within the primary Hopi territory. The boundaries of the Hopi Nation are enclosed entirely within the boundaries of the Navajo Nation. Thanks goodness for taxpayer supported public-domain images. I went to the National Atlas of the United States, applied a time zone layer and dropped the resulting image into graphics software to affix the proper labels. Actually, more specifically, I made a map. Mapping Itįinally I found a map that demonstrates my point. It shouldn’t be this difficult to find a good time zone map but apparently that’s the case unless one wants coverage of the entire United States. The other online mapping sites provide no help either, and the static maps are entirely hit-or-miss. Mapquest provides time zone boundaries at its higher-level views but those disappear just as I click-down to the proper level of detail. I mentioned the whole Arizona, Navajo, Hopi complexity in my response, but I’d been unable to find a decent map to get the point across. Recently he wondered whether I might have an interest in time zone boundaries. Indiana introduced DST in 2006.Matthew of the prullmw blog is a regular reader and commentator on the Twelve Mile Circle. 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 Business Date to Date (exclude holidays).
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