Alaska Time Zone Alaska Time Zone The Alaska Time Zone observes standard time by subtracting nine hours from Coordinated Universal Time (). During daylight saving time its time offset is eight hours (). The clock time in this zone is based on mean solar time at the 135th meridian west of the Greenwich Observatory. The zone includes nearly all of the U.S. state of Alaska and is one hour behind the Pacific Time Zone. The western Aleutian Islands observe Hawaii–Aleutian Time, one hour behind the remainder of the state. Effective from 2007, the local time changes from AKST to AKDT at 02:00 LST
Geology of the United States streams downcut so rapidly that they cut right across the resistant folded rocks of the mountain core, carving canyons across rock layers and geologic structures. Most of Alaska consists of terranes accreted by collisions with island arcs carried in over the last 160 million years. These terranes were caused by the subduction of the Farallon, Kula, and Pacific plates sequentially. Currently, the Pacific plate is subducting beneath Alaska, producing the Aleutian arc series of volcanoes through the Alaskan Peninsula and Aleutian Islands. One of the sutures left by terrane addition is the Denali Fault, which curves through south-central Alaska. The