No.
only one climate zone. but motivated by economical factors there are 2 time zones (day light saving) for Winter and Summer in action till today!
wait till day light saving ends wait till day light saving ends
1972
1958
only on the first day
Arizona and Hawaii do not have Day light saving. http://www.time.gov/
The United States begins Daylight Saving Time on the second Sunday of March and ends it on the first Sunday of November. Unlike Europe, where all the time zones change their clocks at the same time, each time zone in North America changes at 2 AM (except Cuba, where DST begins at midnight and ends at 1 AM).
Arizona, Hawaii, and Puerto Rico do not follow daylight saving time.
British Summer Time (BST)
Woodrow Wilson
None; you always get the hour back when daylight saving time ends.
There are 24 times zones in a day, one for each hour.