Live clocks and city lists for every time zone used in the United States.

The United States and its territories use several standard time zones, and each place in our data is assigned to one of them. Choose a zone below to see its live clock, the states it covers, its largest cities and how it compares with the other zones.

Which time zones are covered?

How do US time zones work?

Each zone is defined by its offset from Coordinated Universal Time. Eastern is UTC−5 in standard time, Central is UTC−6, Mountain is UTC−7 and Pacific is UTC−8, with Alaska at UTC−9 and Hawaii at UTC−10. Most places move their clocks forward by one hour from the second Sunday of March to the first Sunday of November, but Hawaii, most of Arizona and the territories stay on standard time all year.

Why do boundaries matter?

Zone lines follow county and city boundaries rather than straight lines, so several states are split. A call scheduled for a small town near a boundary may fall on a different clock than the nearest large city. Each city page on this site shows the zone used for that specific place, and the hub for each zone explains the exceptions. For a full explanation of the rules, read US time zones explained.

How can you convert times between zones?

Every zone hub contains a table showing what time it is elsewhere when it is noon in that zone. For exact conversions around the spring and autumn clock changes, use a calendar invitation that stores the time with its city, and let each attendee's device convert it. If you need distances for travel planning, the distance calculator gives the straight-line miles between any two cities.