Chamorro Time Zone
Encyclopedia
The Chamorro Time Zone, formerly the Guam Time Zone, observes standard time
by adding ten hours to Coordinated Universal Time
(UTC+10
). The clock time in this zone is based on the mean solar time of the 150th meridian east
of the Greenwich Observatory.
The zone includes the U.S. territories
of Guam
and the Northern Mariana Islands
. Daylight Saving Time
(DST) is not observed anywhere in the zone. Because the original inhabitants of the region are Chamorro, the time in this zone is always known as Chamorro Standard Time (ChST).
The zone is two hours behind Wake Island Time Zone
and 15 hours ahead of North American Eastern Time Zone.
Chamorro Standard Time is practically the same time as Australian Eastern Standard Time
, especially in Queensland
, where it does not observe DST.
Standard time
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. Historically, this helped in the process of weather forecasting and train travel. The concept...
by adding ten hours to Coordinated Universal Time
Coordinated Universal Time
Coordinated Universal Time is the primary time standard by which the world regulates clocks and time. It is one of several closely related successors to Greenwich Mean Time. Computer servers, online services and other entities that rely on having a universally accepted time use UTC for that purpose...
(UTC+10
UTC+10
UTC+10 is an identifier for a time offset from UTC of +10. This time is used in:-As standard time :*Australia **Queensland*Federated States of Micronesia**Chuuk, Yap and surrounding area...
). The clock time in this zone is based on the mean solar time of the 150th meridian east
150th meridian east
The meridian 150° east of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, Asia, the Pacific Ocean, Australasia, the Southern Ocean, and Antarctica to the South Pole....
of the Greenwich Observatory.
The zone includes the U.S. territories
Unorganized territory
An unorganized territory is a region of land without a "normally" constituted system of government. This does not mean that the territory has no government at all or that it is unclaimed territory...
of Guam
Guam
Guam is an organized, unincorporated territory of the United States located in the western Pacific Ocean. It is one of five U.S. territories with an established civilian government. Guam is listed as one of 16 Non-Self-Governing Territories by the Special Committee on Decolonization of the United...
and the Northern Mariana Islands
Northern Mariana Islands
The Northern Mariana Islands, officially the Commonwealth of the Northern Mariana Islands , is a commonwealth in political union with the United States, occupying a strategic region of the western Pacific Ocean. It consists of 15 islands about three-quarters of the way from Hawaii to the Philippines...
. Daylight Saving Time
Daylight saving time
Daylight saving time —also summer time in several countries including in British English and European official terminology —is the practice of temporarily advancing clocks during the summertime so that afternoons have more daylight and mornings have less...
(DST) is not observed anywhere in the zone. Because the original inhabitants of the region are Chamorro, the time in this zone is always known as Chamorro Standard Time (ChST).
The zone is two hours behind Wake Island Time Zone
Wake Island Time Zone
The Wake Island Time Zone observes standard time by adding twelve hours to Coordinated Universal Time . The clock time in this zone is based on the mean solar time of the 180th degree meridian east of the Greenwich Observatory....
and 15 hours ahead of North American Eastern Time Zone.
Chamorro Standard Time is practically the same time as Australian Eastern Standard Time
Time in Australia
Australia uses Standard time, i.e: the same well defined time for a region. The proper names of Australia's time zones are Australian Western Standard Time , Australian Central Standard Time , and Australian Eastern Standard Time...
, especially in Queensland
Queensland
Queensland is a state of Australia, occupying the north-eastern section of the mainland continent. It is bordered by the Northern Territory, South Australia and New South Wales to the west, south-west and south respectively. To the east, Queensland is bordered by the Coral Sea and Pacific Ocean...
, where it does not observe DST.
History
The Mariana Islands were not part of any time zone legislated by the U.S. Congress until the Chamorro time zone was established by Public Law 106-564 on December 23, 2000. Prior to 2000, Guam's standard time was based on territorial Public Law 5-25 (1959) which designated the time Guam Standard Time. The law (Guam Code Annotated, Title 1, Section 1010) was established long before the Northern Mariana Islands came under U.S. sovereignty in 1986, and still remains in the book today despite federal overlap.See also
- Time zoneTime zoneA time zone is a region on Earth that has a uniform standard time for legal, commercial, and social purposes. In order for the same clock time to always correspond to the same portion of the day as the Earth rotates , different places on the Earth need to have different clock times...
- Time offsetTime offsetThe UTC offset is the time offset from Coordinated Universal Time . It is mostly given as hour or hour and minute. Many time zones employ two time offsets, one for standard time and one for daylight saving time...
- Wake Island Time ZoneWake Island Time ZoneThe Wake Island Time Zone observes standard time by adding twelve hours to Coordinated Universal Time . The clock time in this zone is based on the mean solar time of the 180th degree meridian east of the Greenwich Observatory....
- Samoa Time ZoneSamoa Time Zonethumb|right|250px|SST is [[UTC-11]]The Samoa Time Zone observes standard time by subtracting eleven hours from Coordinated Universal Time . The clock time in this zone is based on the mean solar time of the 165th meridian west west of the Greenwich Observatory.The zone includes the U.S...
- Hawaii-Aleutian time zoneHawaii-Aleutian time zoneThe Hawaii-Aleutian Time Zone observes Hawaii-Aleutian Standard Time , by subtracting ten hours from Coordinated Universal Time . The clock time in this zone is based on the mean solar time of the 150th meridian west of the Greenwich Observatory....
- Alaska Time ZoneAlaska Time ZoneThe Alaska Time Zone observes standard time by subtracting nine hours from Coordinated Universal Time . During daylight saving time its time offset is only eight hours . The clock time in this zone is based on the mean solar time of the 135th meridian west of the Greenwich Observatory.The zone...
- Pacific Time ZonePacific Time ZoneThe Pacific Time Zone observes standard time by subtracting eight hours from Coordinated Universal Time . The clock time in this zone is based on the mean solar time of the 120th meridian west of the Greenwich Observatory. During daylight saving time, its time offset is UTC-7.In the United States...
- Mountain Time ZoneMountain Time ZoneThe Mountain Time Zone of North America keeps time by subtracting seven hours from Coordinated Universal Time, also known as Greenwich Mean Time, during the shortest days of autumn and winter , and by subtracting six hours during daylight saving time in the spring, summer, and early autumn...
- Central Time ZoneCentral Time zoneIn North America, the Central Time Zone refers to national time zones which observe standard time by subtracting six hours from UTC , and daylight saving, or summer time by subtracting five hours...
- Eastern Time ZoneEastern Time ZoneThe Eastern Time Zone of the United States and Canada is a time zone that falls mostly along the east coast of North America. Its UTC time offset is −5 hrs during standard time and −4 hrs during daylight saving time...
- Atlantic Time Zone
- Newfoundland Time Zone