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Hawaii–Aleutian Time Zone

From Wikipedia, the free encyclopedia

Hawaii–Aleutian Time Zone
Timezoneswest.PNG
UTC offset
HSTUTC−10:00
HDTUTC−09:00
Current time
14:05, 19 April 2019 HADT [refresh]
Observance of DST
DST is observed in some of this time zone.

The Hawaii–Aleutian Time Zone observes Hawaii–Aleutian Standard Time (HST),[1][2] by subtracting ten hours from Coordinated Universal Time (UTC−10:00). The clock time in this zone is based on the mean solar time of the 150th meridian west of the Greenwich Observatory.

The zone takes its name from the two areas it includes: Hawaii and the portion of Alaska's Aleutian Islands west of 169° 30′ W longitude.

During daylight saving time (DST), the Alaskan portion observes Hawaii–Aleutian Daylight Time (HDT, UTC−09:00), while Hawaii stays on standard time.

From 1900 until 1947, UTC−10:30 was used as standard time in Hawaii.[3]

French Polynesia uses UTC−10:00 for its major cities. The Cook Islands also use the same time. These areas do not use DST. "Hawaii–Aleutian Time Zone" is a U.S. term and for that reason the Polynesian areas are not considered to be a part of the Hawaii–Aleutian Time Zone.

Major metropolitan areas

Other significant places

See also

References

  1. ^ ""U.S. Government Printing Office Style Manual: An official guide to the form and style of Federal Government printing"" (PDF). U.S. Government Printing Office. 2008. p. 234. Retrieved 2017-07-24. Time zones §9.47. The following forms are to be used when abbreviating names of time zones: ... HDT—Hawaii-Aleutian daylight time (not observed in HI) ... HST—Hawaii-Aleutian standard time
  2. ^ ""What are the time zones in the United States?"". National Institute of Standards and Technology, U.S. Department of Commerce. 2016. Retrieved 2017-07-24. Hawaii-Aleutian (HT); HST -10; HDT -9; DST observed in Aleutian Islands, but not Hawaii
  3. ^ "Sources for Time Zone and Daylight Saving Time Data". Retrieved 2012-06-18.[not in citation given]

External links


This page was last edited on 26 March 2019, at 19:22
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