Best overlap: 12:00 PM to 6:00 PM in Kolkata is 8:30 AM to 2:30 PM in Bucharest.
12:00 PM to 6:00 PM in Kolkata is when Bucharest is also working, at 8:30 AM to 2:30 PM their time. Bucharest is 3.5 hours behind Kolkata, and with 6 hours of overlap you can even run back-to-back calls without stepping outside business hours. The window above shifts seasonally: Bucharest keeps daylight saving while Kolkata ignores it.
| 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 | ||||||||||||||||||||||||
Bucharest Europe/Bucharest |
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. -