Best overlap: 11:30 AM to 6:30 PM in Kolkata is 8:00 AM to 3:00 PM in Oslo.
Kolkata and Oslo overlap from 11:30 AM to 6:30 PM (Kolkata) to the equivalent 8:00 AM to 3:00 PM in Oslo — that's your meeting window. Oslo is 3.5 hours behind Kolkata, yet you get a full 7 hours of shared hours — enough to schedule around lunches, focus time, and preferences with ease. The difference isn't constant year-round: Oslo 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 |
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Kolkata Asia/Kolkata | ||||||||||||||||||||||||
Oslo Europe/Oslo |
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. -