The continental United States (the 50 contiguous states) is divided into 4 time zones: Eastern Standard Time (EST) The time zone New York is in, which is 5 hours behind Greenwich Mean Time (GMT) Central Standard Time (CST) The time zone Chicago is in, which is 6 hours behind Greenwich Mean Time (GMT) Mountain Standard Time (MST) Which is 7 hours behind Greenwich Mean Time (GMT) Pacific Standard Time (PST) The time zone Los Angeles is in, which is 8 hours behind Greenwich Mean Time (GMT) Alaska and Hawaii have their own time zones Alaska Standard Time (AKST) and Hawaii Standard Time (HST) respectively. Daylight Saving Time Begins for most of the United States at 2am on the first Sunday of April. Time reverts to standard time at 2am on the last Sunday of October. 
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