Best overlap: 2:00 PM to 6:00 PM in Kolkata is 8:30 AM to 12:30 PM in Manchester.
Plan around 2:00 PM to 6:00 PM in Kolkata, which is 8:30 AM to 12:30 PM in Manchester, to catch everyone during office hours. Manchester is 5.5 hours behind Kolkata, so you've got a workable 4-hour overlap — ideal for a standing meeting around 2:00 PM in Kolkata (8:30 AM in Manchester). Don't be caught out by clock changes — Manchester observes daylight saving and Kolkata doesn't, so the offset varies by an hour through the year.
London to New York is five hours apart, except for the five weeks a year when it isn't. Exact overlap windows for every US zone, the 2026 DST mismatch dates, and where to put the recurring sync. -
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. -