When does the time change in Europe vs the US? The weeks a year your meetings shift
By the Slotlu team · Published
In 2027 the US changes its clocks on March 14 and November 7; the EU and the UK on March 28 and October 31. Between those dates New York is 4 hours behind London instead of 5 (and 5 behind Berlin instead of 6): two weeks in March and one week at the turn of October and November. A call fixed in New York time starts an hour earlier for everyone in Europe during those weeks.
The two rules
- EU: summer time begins and ends “at 1.00 a.m., Greenwich Mean Time”, on the last Sunday in March and the last Sunday in October, in every member state (Directive 2000/84/EC, Articles 2 and 3). Because the moment is fixed in GMT, London, Berlin and Athens all change at the same instant, at different local times. The UK left the EU but changes on the same dates in the time zone data.
- US: daylight saving time runs from 2:00 a.m. local time on the second Sunday of March to 2:00 a.m. on the first Sunday of November (15 U.S. Code § 260a), so each US zone changes an hour after the one to its east. The same section lets a state exempt itself; in the time zone data, Phoenix has no clock changes.
2027 and 2028 dates and local times
2027
| City | Clocks forward | Clocks back |
|---|---|---|
| New York | 2027-03-14, 02:00 → 03:00 | 2027-11-07, 02:00 → 01:00 |
| Chicago | 2027-03-14, 02:00 → 03:00 | 2027-11-07, 02:00 → 01:00 |
| Denver | 2027-03-14, 02:00 → 03:00 | 2027-11-07, 02:00 → 01:00 |
| Los Angeles | 2027-03-14, 02:00 → 03:00 | 2027-11-07, 02:00 → 01:00 |
| London | 2027-03-28, 01:00 → 02:00 | 2027-10-31, 02:00 → 01:00 |
| Paris / Berlin | 2027-03-28, 02:00 → 03:00 | 2027-10-31, 03:00 → 02:00 |
| Athens | 2027-03-28, 03:00 → 04:00 | 2027-10-31, 04:00 → 03:00 |
2028
| City | Clocks forward | Clocks back |
|---|---|---|
| New York | 2028-03-12, 02:00 → 03:00 | 2028-11-05, 02:00 → 01:00 |
| Chicago | 2028-03-12, 02:00 → 03:00 | 2028-11-05, 02:00 → 01:00 |
| Denver | 2028-03-12, 02:00 → 03:00 | 2028-11-05, 02:00 → 01:00 |
| Los Angeles | 2028-03-12, 02:00 → 03:00 | 2028-11-05, 02:00 → 01:00 |
| London | 2028-03-26, 01:00 → 02:00 | 2028-10-29, 02:00 → 01:00 |
| Paris / Berlin | 2028-03-26, 02:00 → 03:00 | 2028-10-29, 03:00 → 02:00 |
| Athens | 2028-03-26, 03:00 → 04:00 | 2028-10-29, 04:00 → 03:00 |
The weeks the gap shrinks
| Year | New York is 4 h behind London |
|---|---|
| 2027 | 2027-03-14 to 2027-03-27; 2027-10-31 to 2027-11-06 |
| 2028 | 2028-03-12 to 2028-03-25; 2028-10-29 to 2028-11-04 |
The same weeks apply to every pair of a US zone that observes daylight saving and an EU or UK zone: Chicago is 5 hours behind London instead of 6, Los Angeles 7 instead of 8, New York 5 behind Paris and Berlin instead of 6. A weekly 11:00 a.m. New York call lands like this:
| Tuesday | New York | London | Berlin |
|---|---|---|---|
| 2027-03-09 | 11:00 a.m. | 4:00 p.m. | 5:00 p.m. |
| 2027-03-16 | 11:00 a.m. | 3:00 p.m. | 4:00 p.m. |
| 2027-03-30 | 11:00 a.m. | 4:00 p.m. | 5:00 p.m. |
| 2027-10-26 | 11:00 a.m. | 4:00 p.m. | 5:00 p.m. |
| 2027-11-02 | 11:00 a.m. | 3:00 p.m. | 4:00 p.m. |
| 2027-11-09 | 11:00 a.m. | 4:00 p.m. | 5:00 p.m. |
Anything fixed in New York time moves one hour earlier in Europe for those weeks: a call at 5:00 p.m. in Berlin becomes 4:00 p.m. A series created in London or Berlin time moves an hour later for the US side instead.
What the planner shows in those weeks
Here is the weekly call for New York, London and Berlin on 9, 16 and 30 March 2027:
Open this example in the planner →
The message for everyone says it in words, so nobody has to remember which side changed:
Hi everyone, Proposed time for “Weekly sync”: Tue, Mar 16 · 11:00 AM–12:00 PM EDT (New York) Priya · London: Tue, Mar 16 · 3:00 PM–4:00 PM GMT Lena · Berlin: Tue, Mar 16 · 4:00 PM–5:00 PM CET Clocks change in New York on Sun, Mar 14; the times above already include that. Reply if it does not work for you.
Sources
- Directive 2000/84/EC on summer-time arrangements (EUR-Lex): Articles 2 and 3
- 15 U.S. Code § 260a (Cornell LII): US daylight saving period
- IANA Time Zone Database: the data behind every date and local time in the tables
Pages read on 10 November 2026. Offsets, rankings and messages on this page are computed with the planner’s own code from the IANA time zone data in the browser; open any example to repeat them.
Next steps
- Open the meeting planner and pick a date in March or late October.
- US and India meeting times: where only the US side changes.
- Schedule a meeting across time zones: from hours to a calendar invite.