U.S. time zones: IANA identifiers and offsets
Eastern, Central, Mountain, Pacific, Alaska and Hawaii time zones with system identifiers.
|
Eastern Time
|
1 | America/New_York | UTC−05:00 / −04:00 | ET | East Coast (NY, DC, FL, etc.) |
|---|---|---|---|---|---|
|
Central Time
|
2 | America/Chicago | UTC−06:00 / −05:00 | CT | Midwest and much of the South |
|
Mountain Time
|
3 | America/Denver | UTC−07:00 / −06:00 | MT | Rocky Mountain states |
|
Arizona (no DST most of year)
|
4 | America/Phoenix | UTC−07:00 | MST | Most of Arizona year-round |
|
Pacific Time
|
5 | America/Los_Angeles | UTC−08:00 / −07:00 | PT | California, Washington, Oregon |
|
Alaska Time
|
6 | America/Anchorage | UTC−09:00 / −08:00 | AKT | Most of Alaska |
|
Hawaii-Aleutian (Alaska islands)
|
7 | America/Adak | UTC−10:00 / −09:00 | HAT | Aleutian Islands |
|
Hawaii Time
|
8 | Pacific/Honolulu | UTC−10:00 | HT | Hawaii (no DST) |
|
Atlantic Time (Puerto Rico)
|
9 | America/Puerto_Rico | UTC−04:00 | AST | Puerto Rico |
|
Eastern (Indiana)
|
10 | America/Indiana/Indianapolis | UTC−05:00 / −04:00 | ET | Much of Indiana |
|
Mountain (Idaho)
|
11 | America/Boise | UTC−07:00 / −06:00 | MT | Southern Idaho |
|
Eastern (Michigan)
|
12 | America/Detroit | UTC−05:00 / −04:00 | ET | Michigan |
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About
U.S. time zones at a glance
The contiguous United States spans Eastern, Central, Mountain and Pacific time. Alaska and Hawaii sit further west. Most zones observe daylight saving time; Arizona (outside the Navajo Nation) and Hawaii generally do not.
Prefer IANA identifiers such as America/New_York in software instead of hard-coding “UTC−5”. Rules change; the identifier tracks the right local policy.
This list is the U.S. counterpart to Brazil’s timezone table on DexBase.
Frequently asked questions
What time zone is New York?
America/New_York — Eastern Time.
Does Arizona use daylight saving time?
Most of Arizona stays on Mountain Standard Time year-round. Always check the specific IANA zone for edge cases.
