Best overlap: 11:30 AM to 6:30 PM in Kolkata is 8:00 AM to 3:00 PM in Berlin.
Schedule calls for 11:30 AM to 6:30 PM in Kolkata — your colleagues in Berlin will be online from 8:00 AM to 3:00 PM. With 7 hours of daily overlap, these two cities are an easy pairing; almost any reasonable hour works. These times hold for most of the year, but Berlin's daylight saving (which Kolkata doesn't use) shifts them by an hour twice annually.
| 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 | ||||||||||||||||||||||||
Berlin Europe/Berlin |
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. -
One in San Francisco, one in London, one in Sydney. Many of the best startups are built this way, and many fail because of it. A practical playbook for co-founder relationships across time zones in the first three years. -
An 8 AM Pacific launch is 5 PM in London and 1 AM in Sydney. Your blog post, your engineering on-call, your support team, and your Twitter schedule are all picking different hours. Here is how to plan a launch that does not embarrass you in any time zone. -