Best overlap: 8:00 AM to 3:00 PM in Oslo is 11:30 AM to 6:30 PM in Kolkata.
Oslo and Kolkata overlap from 8:00 AM to 3:00 PM (Oslo) to the equivalent 11:30 AM to 6:30 PM in Kolkata — that's your meeting window. 7 hours of shared hours is more than enough — slot meetings wherever they're most convenient for the people involved. One seasonal catch: Oslo springs forward and falls back, but Kolkata doesn't, so the gap changes by an hour for several months of the year.
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Oslo Europe/Oslo | ||||||||||||||||||||||||
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. -