Twice a year, millions of Americans engage in the collective ritual of changing their clocks. While our smartphones and computers update automatically, our internal biological clocks—and our meeting schedules—often struggle to keep up.
If you work with remote teams or have family in different states, navigating the switch can be highly confusing. Let's break down exactly when Daylight Saving Time (DST) begins and ends in the United States.
The Rule: "Spring Forward, Fall Back"
The United States follows a strict federal schedule for Daylight Saving Time. The easiest way to remember which way to turn the clocks is the old phrase: "Spring forward, fall back."
When Do We "Fall Back"? (DST Ends)
Daylight Saving Time officially ends on the first Sunday in November at 2:00 AM local time.
- What happens? Clocks are turned backward by 1 hour (from 2:00 AM to 1:00 AM).
- The result: You gain an extra hour of sleep. The mornings become brighter earlier, but the sun sets much earlier in the evening, often before you leave work.
When Do We "Spring Forward"? (DST Begins)
Daylight Saving Time begins on the second Sunday in March at 2:00 AM local time.
- What happens? Clocks are turned forward by 1 hour (skipping from 1:59 AM directly to 3:00 AM).
- The result: You lose an hour of sleep. The mornings are temporarily darker, but daylight extends much further into the evening.
Did you know our Interactive US Time Zone Map has a built-in Smart DST Alert?
If you are planning a meeting within 15 days of a time change (in March or November), a dynamic warning banner will automatically appear at the top of the map. This ensures you never accidentally schedule a meeting at the wrong time because of shifting clocks.
Do All US States Change Their Clocks?
No! This is where time zone math gets particularly tricky for businesses. Under the Uniform Time Act, states can choose to exempt themselves from observing Daylight Saving Time.
- Arizona: Does not observe DST (with the exception of the Navajo Nation). They stay on Mountain Standard Time (MST) all year to keep summer evenings cooler.
- Hawaii: Does not observe DST. Because it is so close to the equator, daylight hours remain relatively constant year-round.
- US Territories: Puerto Rico, Guam, American Samoa, and the US Virgin Islands also do not observe DST.
How the Time Change Affects Global Meetings
If you work with international clients, November and March are danger zones for missed meetings. For example, the European Union (EU) ends its "Summer Time" on the last Sunday in October—a full week or two before the US ends DST.
During this short window, the time difference between New York and London shrinks from 5 hours to 4 hours. Once the US falls back in November, the gap returns to 5 hours. Always rely on a live converter tool during these transition weeks to avoid logging into a meeting an hour early or late!