Alaska Time Zone to 1967 refer to this zone as Central Alaska Standard Time (CAT) or as Alaska Standard Time (AST). In 1966, the Uniform Time Act renamed the UTC−10 zone to Alaska-Hawaii Standard Time (AHST), effective April 1, 1967. This zone was renamed in 1983 to Hawaii-Aleutian Standard Time when the majority of Alaska was moved out of the zone. Prior to 1983, the current Alaska Time Zone (UTC−9) was known as the Yukon Time Zone, observing Yukon Standard Time (YST). This time zone included Canada's Yukon Territory and a small portion of Alaska including Yakutat. The Alaska Panhandle communities were in
Southcentral Alaska Mount Wrangell. The Cook Inlet volcanoes, located in the Tordrillo Mountains and in the north end of the Aleutian Range, are newer, lie in the West, and include Mount Redoubt, Mount Iliamna, Hayes Volcano, Mount Augustine, Fourpeaked Mountain and Mount Spurr. Most recently, Augustine and Fourpeaked erupted in 2006, and Mount Redoubt erupted in March 2009, resulting in airplane flight cancellations. Southcentral Alaska Southcentral Alaska is the portion of the U.S. state of Alaska consisting of the shorelines and uplands of the central Gulf of Alaska. Most of the population of the state lives in this region, concentrated in and