Best overlap: 11:30 AM to 6:30 PM in Kolkata is 8:00 AM to 3:00 PM in Vienna.
The hours that work for both Kolkata and Vienna are 11:30 AM to 6:30 PM (Kolkata) and 8:00 AM to 3:00 PM (Vienna). Plenty of room to work with: 7 hours of daily overlap means you can prioritise people's preferences over the clock. Note the seasonal wrinkle: when Vienna 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Kolkata Asia/Kolkata | ||||||||||||||||||||||||
Vienna Europe/Vienna |
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. -