Calculator
Time Duration Calculator
Find elapsed time between two clock times, or add and subtract a duration.
Time between two times
Add or subtract a duration
How clock time is handled
The first calculator treats both times as occurring on the same day unless you select the next-day option. If the end time is earlier than the start time, select that option to calculate across midnight.
The add and subtract calculator reports when the result falls on a previous or following day. It uses clock time only, with no date or time zone conversion.