Berlin sits 7 hours ahead of Chicago for most of the year. When it is 14:00 in Paris, it is 07:00 in Dallas. But for roughly three weeks scattered across March and October, that gap collapses to 6 hours. The shift trips up recurring meetings, quarterly calls, and anyone booking a flight. Here is how to get the conversion right every time.
What is the time difference between CET and CST?
Central European Time runs at UTC+1. Central Standard Time runs at UTC−6. Subtract 7 hours from CET to land on CST. That is the baseline.
- 09:00 CET → 02:00 CST
- 12:00 CET → 05:00 CST
- 17:00 CET → 10:00 CST
- 21:00 CET → 14:00 CST
The offset holds from early November through mid-March, when both zones sit on standard time.
Does the CET to CST gap change during summer?
Yes and no. The gap stays at 7 hours, but the labels change. In summer, Central Europe moves to Central European Summer Time (CEST, UTC+2). The US Central zone moves to Central Daylight Time (CDT, UTC−5). Both shift forward one hour, so the difference remains 7 hours. The names change. The math does not.
CET to CST conversion table
| CET / CEST | CST / CDT |
|---|---|
| 00:00 | 17:00 (previous day) |
| 06:00 | 23:00 (previous day) |
| 09:00 | 02:00 |
| 12:00 | 05:00 |
| 15:00 | 08:00 |
| 17:00 | 10:00 |
| 21:00 | 14:00 |
| 23:00 | 16:00 |
When is the CET to CST difference only 6 hours?
Twice a year, the US and EU clock changes drift apart.
The US springs forward on the second Sunday in March and falls back on the first Sunday in November. The EU springs forward on the last Sunday in March and falls back on the last Sunday in October. Those mismatched dates create two windows where one side has changed clocks and the other has not.
March gap (roughly 2 weeks): US moves to daylight time first. Central Europe stays on standard time. Subtract 6 hours instead of 7.
October gap (roughly 1 week): Europe falls back to standard time first. The US remains on daylight time. Again, subtract 6 hours.
During these windows, a 15:00 CET call hits 09:00 CST, not 08:00. Check the exact dates for the current year before you schedule anything in late March or late October.
When can you call from Central Europe to the US Central zone?
European afternoon meets US Central morning. That is the only reliable overlap.
- Best window: 15:00-18:00 CET (08:00-11:00 CST)
- US afternoon calls (13:00-17:00 CST) land at 19:00-23:00 CET. Too late for most offices in Berlin, Munich, or Vienna, where the workday often ends by 16:30 or 17:00.
A 16:00 CET call is late in the day for Hamburg but still early morning in Chicago. Book that slot.
What cities use CET and CST?
Central European Time covers Paris, Berlin, Madrid, Rome, Vienna, Warsaw, Budapest, Prague, Barcelona, Munich, Milan, Hamburg, Cologne, Belgrade, and Algiers. Algiers and Tunis stay on UTC+1 year-round; they do not observe daylight time.
Central Standard Time covers Chicago, Dallas, Minneapolis, Mexico City, and Winnipeg.
How do the March and October 2026 clock changes affect the gap?
- Sunday 29 March 2026: Europe moves forward. Clocks jump from 02:00 CET to 03:00 CEST.
- Sunday 25 October 2026: Europe moves back. Clocks fall from 03:00 CEST to 02:00 CET.
- Sunday 28 March 2027: Europe moves forward again. 02:00 CET becomes 03:00 CEST.
- Sunday 31 October 2027: Europe moves back again. 03:00 CEST becomes 02:00 CET.
Cross-check those dates against the US switch (second Sunday in March, first Sunday in November) to spot the gap weeks.
CET to CST working-hours cheat sheet
- Standard time: CET (UTC+1) to CST (UTC−6) → 7 hours apart
- Summer time: CEST (UTC+2) to CDT (UTC−5) → still 7 hours apart
- March gap: US changes first → 6 hours apart for roughly 2 weeks
- October gap: Europe changes first → 6 hours apart for roughly 1 week
- Best calling slot: 15:00-17:00 CET → 08:00-10:00 CST
- Skip: anything after 18:00 CET if you need someone in Dallas or Chicago
- Check before you book: confirm the exact US and EU DST dates for the current year