Alaska Time Zone to 03:00 LDT on the second Sunday in March and returns at 02:00 LDT to 01:00 LST on the first Sunday in November. Two time zones have been referred to as the "Alaska Time Zone": a zone based on UTC−10 that covered much of Central Alaska in the early 20th century, and a zone based on UTC−9 zone that has covered all of the state except the Aleutian Islands since 1983. The Standard Time Act of 1918 authorized the Interstate Commerce Commission to define each time zone. The United States Standard Alaska Time was designated as UTC−10. Some references prior
Southwest Alaska the Wood-Tikchik Lakes, Lake Iliamna, and Lake Clark; the western heights of the Alaska Range, and its continuation southward as the Aleutian Range along the Alaska Peninsula and Aleutian Islands. The Kodiak Archipelago, in the Pacific east of the Alaska Peninsula, is the most eastern part of Southwest Alaska. Southwest roughly comprises Aleutians East, Bristol Bay, Kodiak Island, Lake and Peninsula boroughs, plus the portion of the Kenai Peninsula Borough that lies west of Cook Inlet; along with the Aleutians West, Bethel, Dillingham, and Kusilvak census areas. These areas have a combined area of , slightly larger than California. Volcanic