Live, second-by-second time for every US time zone, state, and city — computed straight from the IANA time zone database, so daylight saving is always handled correctly. Most US clocks fall from 2:00 AM back to 1:00 AM — you gain an hour. Arizona, Hawaii, and the US territories don't change at all. Time by US zone Why the US has nine time zones The contiguous United States spans four time zones — Eastern, Central, Mountain, and Pacific — each an hour apart, so noon on the East Coast is 9:00 AM on the West Coast. Add Alaska and Hawaii-Aleutian Time for the two non-contiguous states, plus Atlantic Time for Puerto Rico and the US Virgin Islands, and Samoa and Chamorro Time for the Pacific territories, and the country spans nine zones in total — more than any other country except France and Russia when territories are included. Most of the country also observes daylight saving time, shifting clocks forward each spring and back each fall, with Arizona and Hawaii as the two notable holdouts. Frequently asked questions

How many time zones does the United States use? The US uses nine time zones: Eastern, Central, Mountain, Pacific, Alaska, Hawaii-Aleutian, Atlantic (Puerto Rico and the US Virgin Islands), Samoa, and Chamorro (Guam and the Northern Mariana Islands). Which US states don't observe daylight saving time? Arizona (outside the Navajo Nation) and Hawaii stay on standard time year-round, as do Puerto Rico, the US Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands. What US states are split between two time zones? Fourteen states have territory in more than one time zone, including Florida, Texas, Indiana, Kentucky, Tennessee, Idaho, Oregon, Kansas, Nebraska, Nevada, North Dakota, South Dakota, Michigan, and Alaska. Arizona is a related but separate case — it's a single zone that opts out of daylight saving, except for the Navajo Nation portion, which does observe it.