When does daylight saving time start in 2025?

DST in the USA starts March 9, 2025 and ends November 2, 2025. Clocks spring forward 1 hour in March and fall back 1 hour in November. Arizona and Hawaii don't observe DST.

What is the difference between EST and EDT?

EST (Eastern Standard Time) is UTC-5 and is observed in winter. EDT (Eastern Daylight Time) is UTC-4 and is observed during daylight saving time in summer. Together they are called ET (Eastern Time).

Time Zone Converter — Convert World Time Zones — Free Online Tool | Temporary Email Address generator edu email 2026

US Time Zones Explained

The contiguous United States spans four primary time zones: Eastern (ET), Central (CT), Mountain (MT), and Pacific (PT). Alaska and Hawaii have their own zones. The difference between the East and West Coast is always 3 hours — when it's 9 AM in New York (ET), it's 6 AM in Los Angeles (PT). During daylight saving time (DST), which runs from the second Sunday in March to the first Sunday in November, all US zones (except Arizona and Hawaii) shift forward one hour.

US Time Zone Reference Table

Zone	Abbreviation	UTC Offset	DST Offset	Major Cities
Eastern	ET / EST / EDT	UTC−5	UTC−4	New York, Miami, Boston, Atlanta
Central	CT / CST / CDT	UTC−6	UTC−5	Chicago, Houston, Dallas, Minneapolis
Mountain	MT / MST / MDT	UTC−7	UTC−6	Denver, Phoenix, Salt Lake City
Pacific	PT / PST / PDT	UTC−8	UTC−7	Los Angeles, Seattle, San Francisco
Alaska	AKT / AKST	UTC−9	UTC−8	Anchorage, Fairbanks
Hawaii	HST	UTC−10	No DST	Honolulu, Hilo

Frequently Asked Questions

The United States has 6 standard time zones: Eastern (ET), Central (CT), Mountain (MT), Pacific (PT), Alaska (AKT), and Hawaii–Aleutian (HST). Including US territories, there are additional zones such as Atlantic (AT) for Puerto Rico and the US Virgin Islands, and Samoa Standard Time (SST) for American Samoa.

In 2025, Daylight Saving Time in the United States starts on Sunday, March 9, 2025 (clocks spring forward 1 hour at 2 AM) and ends on Sunday, November 2, 2025 (clocks fall back 1 hour at 2 AM). Arizona (except the Navajo Nation) and Hawaii do not observe DST and stay on standard time year-round.

UTC (Coordinated Universal Time) is the global time standard. US time zones are offsets from UTC: Eastern is UTC−5 (or UTC−4 during DST), Central is UTC−6 (UTC−5 DST), Mountain is UTC−7 (UTC−6 DST), and Pacific is UTC−8 (UTC−7 DST). UTC doesn't change for daylight saving — only local offsets change.