Best overlap: 8:00 AM to 3:00 PM in Zurich is 11:30 AM to 6:30 PM in Kolkata.
The hours that work for both Zurich and Kolkata are 8:00 AM to 3:00 PM (Zurich) and 11:30 AM to 6:30 PM (Kolkata). You won't be short on options — 7 hours of overlap leaves space for recurring syncs and ad-hoc calls alike. The difference isn't constant year-round: Zurich adjusts for daylight saving while Kolkata holds steady.
| Local time | 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Zurich Europe/Zurich | ||||||||||||||||||||||||
Kolkata Asia/Kolkata |
A complete guide to time zones in 2025, from UTC and GMT differences to Daylight Saving Time changes, IANA database rules, abbreviation pitfalls, and developer best practices for handling global time. -