Best overlap: 3:00 PM to 6:00 PM in Hanoi is 8:00 AM to 11:00 AM in Manchester.
Schedule calls for 3:00 PM to 6:00 PM in Hanoi — your colleagues in Manchester will be online from 8:00 AM to 11:00 AM. Manchester is 7 hours behind Hanoi, leaving about 3 hours of daily overlap — enough for most meetings if you don't leave them too late in the day. Remember that Manchester shifts for daylight saving and Hanoi doesn't, so recalculate the overlap after each clock change.
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. -