zone

The nine U.S. time zones, east to west:

            Atlantic standard time (AST)

            eastern standard time (EST)

            central standard time (CST)

            mountain standard time (MST)

            Pacific standard time (PST)

            Alaska standard time (AKST)

            Hawaii-Aleutian standard time (HST)

            Samoa standard time (UT-11)

            Chamorro standard time (UT+10)

Note that for editorial mentions of National Geographic Channel programs, NGP preferred style for time zones in air times is to list Eastern time followed by a slash, then Central time followed by a lowercase "c": 10/9c.