Daylight Saving Time Dates 2025–2045

Last reviewed on May 4, 2026

In the United States, Daylight Saving Time (DST) starts at 02:00 local time on the second Sunday in March and ends at 02:00 local time on the first Sunday in November. Clocks jump forward one hour in spring and fall back one hour in autumn. This page lists every change date from 2025 through 2045, explains the rule, notes the parts of the country that don't observe DST, and walks through the practical effects on schedules.

The US rule, in one sentence

Since the Energy Policy Act of 2005 took effect in 2007, DST in the US has run from the second Sunday in March through the first Sunday in November. The rule is fixed and predictable for as long as Congress leaves it alone, which means every date below is computed mechanically from the same two clauses.

Spring-forward and fall-back dates, 2025–2045

Every period above is exactly 238 days, because both endpoints move together. That makes year-over-year comparisons of energy use, retail traffic, and TV ratings unusually clean — the same number of "DST days" every year.

What happens at the change

Spring forward

At 02:00 local time on the second Sunday in March, the clock jumps to 03:00. The 02:00 hour does not exist that day. Most people lose an hour of sleep on Saturday night. Sunrise and sunset shift one hour later by the clock — in practical terms, mornings are darker for a few weeks and evenings are lighter.

Fall back

At 02:00 local time on the first Sunday in November, the clock jumps back to 01:00. The 01:00 hour happens twice — once in DST, once in standard time. Most people gain an hour of sleep. Sunrise and sunset shift one hour earlier by the clock; mornings are lighter, evenings darker.

Where DST is not observed in the US

• Hawaii. Has not observed DST since 1967.
• Most of Arizona. Statewide opt-out since 1968. The exception is the Navajo Nation, which does observe DST.
• US territories. Puerto Rico, the US Virgin Islands, American Samoa, Guam, and the Northern Mariana Islands stay on standard time year-round.

Other countries follow different rules. The European Union switches on the last Sunday in March and the last Sunday in October, which is offset from the US by one or two weeks each spring and autumn. Most of Asia, Africa, and South America do not observe DST.

Worked example: a meeting between New York and London in late October

On the last Sunday in October, the UK ends British Summer Time and falls back to Greenwich Mean Time (GMT). The US stays on Eastern Daylight Time for one more week, until the first Sunday of November. During that one-week gap, New York and London are four hours apart instead of the usual five. A 9 a.m. New York meeting that's normally 14:00 in London is 13:00 for that week, then back to 14:00 the following week. Calendar invites that are stored as UTC handle this automatically; invites stored as a local-clock time may need to be re-checked.

Effect on the calendar pages

The dates and weekdays on every monthly calendar on the Site are unaffected by DST — March 8, 2026 is a Sunday whether the clocks change or not. What DST changes is the time of day, not the date. The Site doesn't mark DST start/end days on the month grids because the change is purely a time-of-day event. Use this page to look up the date.

On the spring-forward day, the calendar day still has 24 calendar hours by official definition, but only 23 wall-clock hours. On the fall-back day, the calendar day has 25 wall-clock hours. Working-day counts and ISO week numbers ignore the difference.

Practical implications

• Schedules and alarms. Most operating systems and calendar apps adjust automatically. Mechanical clocks, oven timers, microwaves, and some basic wall thermostats don't.
• Payroll for hourly shifts. A shift that crosses 02:00 on the spring-forward Sunday is one hour shorter; the same shift on the fall-back Sunday is one hour longer. Time-tracking systems usually handle this, but it is worth spot-checking the next pay period after each change.
• Air travel. Flight times in published schedules are local. A US domestic flight on the spring-forward Sunday departs 02:30 local but the elapsed flight time is the same as any other day — the arrival time at destination accounts for the change.
• Recurring meetings across regions. The two- to three-week window when the US has switched but Europe hasn't (or vice versa) is the most common source of meeting confusion. Anchor recurring international meetings in UTC if your calendar tool supports it.
• Health. The spring-forward change is associated in published research with short-term increases in traffic accidents and cardiac events. Most of the effect is gone within a week.

Will the US stop changing the clocks?

Bills to make either DST or standard time permanent have been introduced in Congress repeatedly, most prominently the Sunshine Protection Act in 2022. None has been enacted into law. Until that changes, the rule above continues to apply — which is why the table covers every year through 2045.

Common mistakes

• Thinking the US and Europe change on the same weekend. They don't, and the gap is usually two weeks in spring and one week in autumn.
• Assuming Arizona shifts with the rest of the Mountain Time Zone. Most of Arizona stays on Mountain Standard Time year-round, so it's effectively on Pacific Time during DST and Mountain Time in winter. For a map of where each US time zone actually applies, see the US time zone map at usamap.net.
• Forgetting that the change happens at 02:00, not midnight. A timestamp at 02:30 on the spring-forward day technically doesn't exist.
• Trusting the wall clock on a microwave or car dashboard for time-sensitive scheduling immediately after the change.

Quick checklist

• Spring forward: second Sunday in March, 02:00 → 03:00.
• Fall back: first Sunday in November, 02:00 → 01:00.
• 238 days on DST every year.
• Hawaii, most of Arizona, and the US territories don't observe DST.
• Sync mechanical clocks the morning of the change.

Related

• March 2026 calendar — the next spring-forward Sunday.
• November 2026 calendar — the next fall-back Sunday.
• Working days vs calendar days — DST does not change the working-day count.
• ISO 8601 week numbers — also unaffected by DST.