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.

There are actually 8 time zones in the lower 48:

EST and EDT
CST and CDT
MST and MDT
PST and PDT

The others would belong to Alaska and Hawaii, not sure what they are actually called.

Sorry, Vet, but half of your times zones don't co-exist, with a very small exception in part of Indiana, and, I think, Arizona. Using you reasoning, there are 6 in the lower 48. Using standard reasoning, DST zones are simply adjusted Standard zones.

Besides Atlantic Time (GMT-4) in Canada & Greenwich Mean Time itself, do time zones outside the the U.S. necessarily have names?

Apparently not, based on a surprisingly educational drop-down list of time zones on my Windows PC: Right-click the clock display (lower right corner), click Adjust Date/Time and click the Time Zone tab, then click the down-arrow to the right of the time zone. A nice geography lesson!