Convert a time across zones and find the overlapping business hours.
Every time zone is a fixed offset from UTC, so converting is an addition followed by a modulo to wrap past midnight. The overlap figure intersects both locations' 09:00-17:00 windows to show how many hours are genuinely available for a live meeting. Scheduling across zones from memory is how meetings get booked at 03:00; the overlap window is the number that actually matters.
Time Zone Difference
Local time = UTC + offset, wrapped into a 24-hour clock
Local time = UTC + offset, wrapped into a 24-hour clock Every time zone is a fixed offset from UTC, so converting is an addition followed by a modulo to wrap past midnight. The overlap figure intersects both locations' 09:00-17:00 windows to show how many hours are genuinely available for a live meeting.
Scheduling across zones from memory is how meetings get booked at 03:00; the overlap window is the number that actually matters.
This calculator takes 3 inputs: Reference time in UTC (24-hour clock), Target UTC offset, Your own UTC offset. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.