Find working-hours overlap across time zones

Pick an actual date and enter each person’s working hours in their own city. A shared slot is the part of the day when everyone can attend for the full meeting duration.

Work through New York and London

On March 9, 2026, the United States had already switched to daylight time and the United Kingdom had yet to switch. If both participants worked 09:00–17:00 local time, their shared window ran from 13:00 to 17:00 UTC.

On March 30, after the UK clock change, the same hours produced a 13:00–16:00 UTC window. A meeting proposed at 16:30 UTC fit the first date and fell after the London workday on the second.

Give an overnight shift its start day

A shift from Monday at 22:00 through Tuesday at 05:00 begins on Monday. Select Monday for the shift and check the Tuesday morning part of the overlap as well. Use a window long enough for the whole meeting.

Include UTC when a clock repeats

When clocks move back, a local time such as 01:30 can occur twice. Include UTC or the numeric UTC offset when sending an invitation during that hour. If the meeting repeats, recheck the actual dates when participants observe different clock changes.

See the IANA time zone database for the rules behind named time zones.