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Information about Hawaii Aleutian Standard Time Zone

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HST is UTC-10
The Hawaii-Aleutian Time Zone observes Hawaii-Aleutian Standard Time (HST), by subtracting ten hours from Coordinated Universal Time (UTC-10). The clock time in this zone is based on the mean solar time of the 150th degree meridian west of the Greenwich Observatory.

The zone also includes Alaska's Aleutian Islands west of 169° 30′ west, along with Hawaii. The portion in the Aleutian islands observes DST while Hawaii does not.

Hawaii used a standard time of GMT-10:30 from 1900 until 1947, when clocks were changed to the present -10:00 zone. [1]

Major Metropolitan Areas

See also

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Time zones in North America
Time ZoneUTC-10UTC-9UTC-8UTC-7UTC-6UTC-5UTC-4UTC-3
NameHawaii-Aleutian StandardAlaska Standard
Hawaii-Aleutian Daylight		Pacific Standard
Alaska Daylight		Mountain Standard
Pacific Daylight		Central Standard
Mountain Daylight		Eastern Standard
Central Daylight		Atlantic Standard
Eastern Daylight		Newfoundland StandardAtlantic DaylightNewfoundland Daylight
Coordinated Universal Time (UTC) is a high-precision atomic time standard. UTC has uniform seconds defined by International Atomic Time (TAI), with leap seconds announced at irregular intervals to compensate for the earth's slowing rotation and other discrepancies.
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The UTC−10 time offset is used in:
  • Cook Islands
  • French Polynesia
  • Society Archipelago including Tahiti,
  • Tuamotu Archipelago, and

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Solar times are measures of the apparent position of the Sun on the celestial sphere. They are not actually the physical time, but rather hour angles, that is, angles expressed in time units.
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meridian (or line of longitude) is an imaginary arc on the Earth's surface from the North Pole to the South Pole that connects all locations with a given longitude. The position of a point on the meridan is given by the latitude.
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Royal Observatory, Greenwich (formerly the Royal Greenwich Observatory or RGO) was commissioned in 1675 by King Charles II, with the foundation stone being laid on 10 August.
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Alaska

Flag of Alaska Seal
Nickname(s): The Last Frontier
Motto(s): "North to the Future"

Official language(s) None[1]
Spoken language(s) English 85.7%,
Native North American 5.
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The Aleutian Islands (possibly from Chukchi aliat, "island") are a chain of more than 300 small volcanic islands forming an island arc in the Northern Pacific Ocean, occupying an area of 6,821 sq mi (17,666 km²) and extending about 1,200 mi (1,900 km) westward from the
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State of Hawaii
Mokuʻāina o Hawaiʻi

Flag of Hawaii Seal of Hawaii
Nickname(s): The Aloha State

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Daylight saving time (DST; also summer time in British English) is the convention of advancing clocks so that afternoons have more daylight and mornings have less.
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Standard time is the result of synchronizing clocks in different geographical locations within a time zone to the same time rather than using the local meridian as in local mean time or solar time. The time so set has come to be defined in terms of offsets from Universal Time.
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Honolulu, Hawaii

Flag
Seal
Nickname: Sheltered Bay and Crossroads of the Pacific
Location in Honolulu County and the state of Hawaii
Coordinates:
Country
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time zone is a region of the Earth that has adopted the same standard time, usually referred to as the local time. Most adjacent time zones are exactly one hour apart, and by convention compute their local time as an offset from UTC (see also Greenwich Mean Time).
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A time offset is defined by international convention as a number of hours and minutes from Coordinated Universal Time in Greenwich, England. Many time zones employ two time offsets, one for standard time and one for daylight saving time.
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time zone is a region of the Earth that has adopted the same standard time, usually referred to as the local time. Most adjacent time zones are exactly one hour apart, and by convention compute their local time as an offset from UTC (see also Greenwich Mean Time).
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The UTC−10 time offset is used in:
  • Cook Islands
  • French Polynesia
  • Society Archipelago including Tahiti,
  • Tuamotu Archipelago, and

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The UTC−9 time zone is used in:
  • French Polynesia
  • Gambier Islands
  • United States (AKST—Alaska Standard Time)
  • Alaska* (most of state)

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UTC−8 is a band of timezones separated from the Universal Coordinated Time by 8 hours.

Timezones

  • Pacific Standard Time
  • Alaska Daylight Time
  • Clipperton Island Standard Time


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UTC−7 can be observed in:
  • Mountain Standard Time Zone
  • Pacific Daylight Time Zone
  • Canada
  • The portion of the Peace River Valley in British Columbia.

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Areas using UTC−6

Single zone countries
  • Belize
  • Costa Rica
  • El Salvador
  • Guatemala
  • Honduras
  • Nicaragua
Multizoned countries
  • Canada, United States (Central Standard Time/Mountain Daylight Time)

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UTC−5 is the time offset used in the North American Central Time Zone during Daylight Saving Time.

For North America see also Eastern Standard Time and Central Daylight Time.
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UTC−4 is the time offset used in the Atlantic Standard Time Zone in Canada in winter and the North American Eastern Time Zone during daylight saving time (DST), as well as other countries.
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Areas using UTC−3

Single zone countries without DST

  • Argentina, Suriname

Single zone countries with DST

  • Uruguay**

Multizone countries

  • Brazil - official time

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The Alaska Time Zone observes standard time by subtracting nine hours from Coordinated Universal Time (UTC-9). During daylight saving time its time offset is only eight hours (UTC-8).
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The Pacific Time Zone observes standard time by subtracting eight hours from Coordinated Universal Time (UTC-8). The clock time in this zone is based on the mean solar time of the 120th degree meridian west of the Greenwich Observatory.
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The Alaska Time Zone observes standard time by subtracting nine hours from Coordinated Universal Time (UTC-9). During daylight saving time its time offset is only eight hours (UTC-8).
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The Mountain Time Zone of North America keeps time by subtracting seven hours from Coordinated Universal Time (UTC-7) during the shortest days of autumn and winter, and by subtracting six hours during daylight saving time in the spring, summer, and early autumn (UTC-6).
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The Pacific Time Zone observes standard time by subtracting eight hours from Coordinated Universal Time (UTC-8). The clock time in this zone is based on the mean solar time of the 120th degree meridian west of the Greenwich Observatory.
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Central Time Zone observes standard time by subtracting six hours from UTC during standard time (UTC−6) and five hours during daylight saving time (UTC−5). The clock time in this zone is based on the mean solar time of the 90th degree meridian west of the Greenwich
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The Mountain Time Zone of North America keeps time by subtracting seven hours from Coordinated Universal Time (UTC-7) during the shortest days of autumn and winter, and by subtracting six hours during daylight saving time in the spring, summer, and early autumn (UTC-6).
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Eastern Time Zone (ET) of the Western Hemisphere falls mostly along the east coast of Northern America and the west coast of South America. Its time offset is UTC-5 during standard time and UTC-4 during daylight saving time.
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