GMT - 9:00 Alaska Standard Time

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). The clock time in this zone is based on the mean solar time of the 135th degree meridian west of the Greenwich Observatory.

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The zone includes nearly all of the U.S. state of Alaska and is one hour behind the Pacific Time Zone, two hours behind the Mountain Time Zone, three hours behind the Central Time Zone, and four hours behind the Eastern Time Zone.