Best overlap: 8:00 AM to 3:00 PM in Warsaw is 11:30 AM to 6:30 PM in Kolkata.
Both teams are at their desks between 8:00 AM to 3:00 PM in Warsaw and 11:30 AM to 6:30 PM in Kolkata. A 7-hour overlap gives you real choice here — early or late in the window both work comfortably. Note the seasonal wrinkle: when Warsaw is on daylight saving and Kolkata isn't, the gap between them grows or shrinks by an hour.
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Warsaw Europe/Warsaw | ||||||||||||||||||||||||
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. -