Chamorro Time Zone

UTC+10 highlighted on a world map.

The Chamorro Time Zone^[1], 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.

Populated areas and major cities

• Hagåtña, Guam
• Saipan, Northern Mariana Islands

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 zone
• Time offset
• Wake Island Time Zone
• Samoa Time Zone
• Hawaii-Aleutian time zone
• Alaska Time Zone
• Pacific Time Zone
• Mountain Time Zone
• Central Time Zone
• Eastern Time Zone
• Atlantic Time Zone
• Newfoundland Time Zone

References

1. ^ "Chamorro" per 15 U.S.C. § 263 as amended and 49 CFR 71.14 (text, PDF).

Sources

• Current time around the world