America/Adak
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United States (US)
Country name: United States
ISO 3166-1 alpha-2 code: US
Number of time zones: 29
Total recorded transitions: 3852 changes across all zones
Current daylight saving status: observes dst
First DST adoption: Year 1918
Abolition year(s): 1942
Re-adoption year(s): 1944
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Time Zones in United States (29)
America/Anchorage
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America/Boise
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America/Chicago
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America/Denver
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America/Detroit
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America/Indiana/Indianapolis
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America/Indiana/Knox
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America/Indiana/Marengo
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America/Indiana/Petersburg
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America/Indiana/Tell_City
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America/Indiana/Vevay
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America/Indiana/Vincennes
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America/Indiana/Winamac
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America/Juneau
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America/Kentucky/Louisville
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America/Kentucky/Monticello
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America/Los_Angeles
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America/Menominee
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America/Metlakatla
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America/New_York
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America/Nome
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America/North_Dakota/Beulah
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America/North_Dakota/Center
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America/North_Dakota/New_Salem
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America/Phoenix
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America/Sitka
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America/Yakutat
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Pacific/Honolulu
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Daylight Saving Observance Timeline
Years when daylight saving time was observed in United States:
19181919192019211922192319241925192619271928192919301931193219331934193519361937193819391940194119421944194519461947194819491950195119521953195419551956195719581959196019611962196319641965196619671968196919701971197219731974197519761977197819791980198119821983198419851986198719881989199019911992199319941995199619971998199920002001200220032004200520062007200820092010201120122013201420152016201720182019202020212022202320242025202620272028202920302031203220332034203520362037
Country boundaries and ISO codes derived from iso3166.tab and zone1970.tab.