UTC − 10

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UTC − 101Name

Zone meridian 150 ° W

NATO DTG W (whiskey)

Time zones
Zone time all year round
Hawaii-Aleutian Standard Time - Hawaii (HAST)
Normal time
  • Hawaii-Aleutian Standard Time (HAST)
  • Tahiti Time (TAHT)
Coordinates: 0 °  N , 150 °  W

UTC − 10 is a zone time which has a semicircle of longitude 150 ° W as the reference meridian. On watches with this zone time, it is ten hours earlier than Coordinated Universal Time and eleven hours earlier than CET .

scope

Regions and time zones that use UTC − 10:

UTC − 10:
  • South Summer / North Standard Time
  • Sea area
    		•
  • North Summer / South Standard Time
  • Standard time all year round
    		•

    All year round

    Standard time (northern hemisphere)

    Hawaii-Aleutian Standard Time Zone (HAST)

    Hawaii-Aleutian Standard Time  ( HAST )

    Summer time / Daylight Saving Time :
    Hawaii-Aleutian Daysaving Time  ( HADT )
    Also: HDT
    Time difference to normal time HAST + 1
    Time difference to world time UTC − 9

    NATO DTG V (Victor)
    Changeover second Sunday in March to first Sunday in November, each time 02:00 HAST ↔ 03:00 HADT
    Applies since March 19, 1918

    Standard Alaska Time EST -5; from 1928 UT -10; War Time Feb. 9, 1942 through Sept. 30, 1945 UT − 9 year round, June 8, 1947 Hawaii-Alaska Standard Time and HAST / HADT; since 1983 only Aleutians West Census Area

    The Hawaii-Aleutian Standard Time (HAST) is the zone time of the Hawaii-Aleutian zone. The designation was introduced in 1983.

    The United States Standard Alaska Time corresponded to the Mean Astronomical Time at 150 ° W since March 19, 1918 (Standard Time Act) , i.e. EST − 5 ( Eastern Standard Time , the mean local time at 75 ° W with the date change at noon, the time standard of the time USA, but Civil Time was in use, i.e. date change at midnight), then UT − 10 after the adoption of world time in 1928, and was valid for almost all of Alaska . From March 31, 1942 to September 30, 1945 ( War time Act ), War Time ( UT − 9 ) was in effect all year round in the USA , and after 1947 the UT − 9 summer time regulation was also adopted in Alaska. After Hawaii took over HAST on June 8, 1947, the time zone was called Hawaii-Alaska Standard Time or Alaska-Hawaii (an) Standard Time .

    Aleutian Islands: Hawaii-Aleutian Standard Time (HAST) or Hawaii-Aleutian Daysaving Time (HADT)

    HAST is now the standard time only in the Aleutians West Census Area (Outer Aleutians) west of 169 ° 30 ′ W. It also applies to the Pribilof Islands in the central Bering Sea. The Hawaii-Aleutian Daysaving Time (HDT, HADT) is used as summer time , which is a time shift from UTC − 9. It has been valid throughout the USA since 2007 from the second Sunday in March to the first Sunday in November, the changeover takes place at 2:00 HAST to 03:00 HADT (Energy Policy Act 2005)

    In 1983, the state of Alaska , to which the Aleutian Islands belong, adopted a time shift from UTC − 9 across the continent and named it Alaska Standard Time (AST), previously a total of four time zones had been common, with AST at UTC − 10. Since then one speaks of Hawaii-Aleutian Standard Time for UTC − 10, which as HAST with HADT is only used in the Outer Aleutian Islands (see History of Alaska: Present ).

    Hawaii-Aleutian Standard Time - Hawaii

    Hawaii-Aleutian Standard Time - Hawaii  ( HAST )
    Also: Hawaiian Standard Time (HST)

    Applies all year round
    Applies since June 8, 1947 (Hawaii)

    1900 to 1947 GMT / UT − 10:30 (UT from 1928); Apr 30 to May 21, 1933 UT − 9:30; 1947 to 1968 HAST / HADT

    There is also a HAST zone in which daylight saving time is not used, Hawaii-Aleutian Standard Time - Hawaii , also known as Hawaiian Standard Time (HST). The time is valid all year round both on the entire Hawai'i archipelago , the 50th US state, and on the Johnston Atoll , which is located to the west and is one of the non-incorporated United States Minor Outlying Islands .

    The normal time is the shortwave transmitter NIST Radio Station WWVH (2.5 / 5/10/15 MHz) on Kaua'i , which is compared with the time signal of the National Institute of Standards and Technology in Fort Collins.

    From 1900 to 1947 Hawai'i used the longitude 157 ° 30 'West as the reference meridian, which runs between the islands of Oʻahu and Molokaʻi , with a time difference of UT − 10:30 ( Universal Time was then universal time, before 1928 the reference was GMT −10: 30 ). Thus the time in the capital Honolulu almost corresponded to the solar time . From April 30, 1933 to May 21, 1933, a trial attempt was made to set daylight saving time to UT − 9:30. On June 8, 1947, HAST was introduced with UT − 10:00, including daylight saving time HADT. In 1966, the Uniform Time Act made it possible to opt out of the entire state from the daylight saving time regulation. Hawaii took this opportunity because a daylight rule is of no use in the tropics, and since 1968 UTC – 10:00 has been valid all year round.

    Tahiti Time or Heure de Tahiti (TAHT)

    Tahiti Time  ( TAHT )
    Heure légale de Tahiti

    Applies all year round
    Applies since 1911

    Heure légale since March 9, 1911 tmP -10: 09: 21, UTC -10: 00 only since August 9, 1978

    The Tahiti Time (TAHT), French Heure de Tahiti or Temps de Tahiti , precisely L'heure légale dans la territoire de la Polynésie Française , is the time zone of French Polynesia for the Society Islands including the main island Tahiti , the Tuamotu Archipelago and the Austral -Islands ( Îles Australes ), but not the Marquesas ( Marquises , UTC − 9: 30 ) and Gambier Islands ( UTC − 9 ). It is valid all year round.

    Historical use

    The liner islands , part of the state of Kiribati since 1979 , used UTC – 10 until the end of 1994, but then switched to UTC + 14 (same time, but different date), so that December 30, 1994 is January 1, 1995 followed.

    Individual evidence

    1. ↑ a b www.time.gov
    2. ↑ US Time Zones. USNO Astronomical Applications Department, November 16, 2007, accessed September 26, 2009 .
    3. ↑ 15 USC § 263 . US Code collection , Title 15, Chapter 6, Subchapter IX Standard Time § 263. Designation of zone standard times.
    4. ↑ a b 49CFR71.12 Code of Federal Regulations , Title 49 Transportation , Subtitle A Office of the Secretary of Transportation. Part 71 Standard Time Zone Boundaries Sec. 71.12 Hawaii-Aleutian zone.
    5. ↑ An Act to preserve daylight and provide standard time for the United States (Standard Time Act) 40 Stat. 450. Approved March 19, 1918. pp. 1854. Public, No. 106. Original US Law 40 Stat. 450 & 56 stat. 9 The first two acts establishing DST in the United States. The Statues At Large of the United States of America 1918. Concurrent Resolutions of the two Houses of Congress. webexhibits.org, accessed September 26, 2009 .
    6. ↑ Heidi G. Yacker: Daylight Saving Time . 98-99 C. In: Library of Congress, Congressional Reference Division (Ed.): Congressional Research . February 9, 1998, Development of Daylight Saving Time ( Web document , webexhibits.org [accessed September 26, 2009]).
    7. ↑ War time Act (56 Stat. 9) Approved January 20, 1942. P. 2160. Public Law 403 (webexhibits.org)
    8. ^ Amendment to the War Time Act 59 Stat. 537. Approved September 25, 1945.
    9. ^ Energy Policy Act of 2005 Pub.L. 109-58 (PDF).
    10. ^ NIST Radio Station WWVH ( Memento from September 21, 2009 in the Internet Archive )
    11. ↑ a b Why does the mainland have daylight savings time and the Hawaiian islands don't? , answers.yahoo.com
    12. ^ Uniform Time Act. PL 89-387. 15 USC § 260a Advancement of time or changeover dates
    13. ^ Uniform Time Act Amendment 1972 PL 92-267.
    14. ↑ Art. 2 Décret no 78-855 du 9 août 1978 relatif à l'heure légale française
    15. ↑ L'Heure légale Française. IMCCE , accessed September 26, 2009 .
    16. ↑ Art. 4 Décret no 79-896 of 17 October 1979 fixant l'heure légale française
    17. ↑ Recommandations pour la security de l'horodatage électronique. Nov. 30, 2002 version 2J , 1.1.1. L'heure sur le territoire de la République. P. 8 (PDF)
    18. ^ Zones Géographiques en Polynésie Française ( Memento of October 13, 2008 in the Internet Archive ) , heuremondiale.com
    19. ↑ Determination within the competence of the territorial authorities according to Art. 3/3 Décret no 78-855