Best overlap: 8:30 AM to 1:30 PM in Geneva is 1:00 PM to 6:00 PM in Kolkata.
Keep meetings inside 8:30 AM to 1:30 PM in Geneva — that maps to 1:00 PM to 6:00 PM in Kolkata. Kolkata is 4.5 hours ahead of Geneva, which gives you a solid 5-hour window. Book earlier in it and neither side is rushing. Remember that Geneva shifts for daylight saving and Kolkata doesn't, so recalculate the overlap after each clock change.
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Geneva 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. -