North American Time Zones: 8 Zones from Hawaii to Newfoundland
Standard Time Zones in North America
From west to east (standard time offsets):
| Zone | Abbr | UTC | Major Areas | DST? |
|---|
| Hawaii–Aleutian | HAST | −10 | Hawaii, W. Aleutians (Adak) | No |
| Alaska | AKST | −9 | Most of Alaska | Yes (AKDT) |
| Pacific | PST | −8 | CA, WA, OR, NV, BC, YT | Yes (PDT) |
| Mountain | MST | −7 | AZ*, CO, MT, NM, UT, WY, AB, NT, NE BC | Most (MDT) |
| Central | CST | −6 | TX, IL, MB, SK*, ON (west), ND, MN | Most (CDT) |
| Eastern | EST | −5 | NY, FL, ON, QC, NB, NS, PE | Yes (EDT) |
| Atlantic | AST | −4 | NB, NS, PE, NL (Labrador) | No |
| Newfoundland | NST | −3:30 | Newfoundland (island) | Yes (NDT −2:30) |
Key Exceptions
- Arizona (except Navajo Nation): No DST → MST year-round.
- Saskatchewan (most): CST year-round (effectively MST+DST).
- Nunavut: Split: Eastern (EST/EDT), Central (CST/CDT), Mountain (MST/MDT).
- Mexico: 4 zones (NW/Pacific, Mountain, Central, SE/Quintana Roo); DST varies by state (most abolished 2022).
- Caribbean: Mostly AST (no DST) or EST (US territories).
Daylight Saving Time (2024)
- Starts: **Mar 10** (2:00 → 3:00)
- Ends: **Nov 3** (2:00 → 1:00)
- Not observed: HI, AZ (mostly), SK, YT, BC (some), MX (most), Caribbean, Central America.
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