I didn't post this in Trivia because I don't know the answer. I went to a training session earlier this week, and one of the trivia questions she asked was "how many time zones are in the U.S.?" The answer is six, but I could not name the other two:

EST-Eastern Standard
CST-Central Standard
MST-Mountain Standard
PST-Pacific Standard

What are Alaska and Hawaii time zones called? I will mail the answer to my work mates.

Alaska Daylight or Standard Time
Hawaii-Aleutian Daylight or Standard Time

However, there are really 9 official US Time Zones because there are possessions of the US that are included;

Zones outside the states
Atlantic Standard Time (AST, UTC-4, Zone Q), which comprises Puerto Rico and the U.S. Virgin Islands.
Samoa Standard Time (UTC-11, Zone X), which comprises American Samoa.
Chamorro Standard Time ([[UTC+10]], Zone K), which comprises Guam and the Northern Mariana Islands.