Hours · Minutes

Time duration calculator

Measure shift lengths, flight blocks, or billable hours — and add or subtract time from any clock.

Converting across cities? Use the time zone converter or meeting planner for multi-city overlap.

Duration & math

Mode

Start time End time

Does overnight work?

Yes. If the end time is earlier than the start, we treat it as crossing midnight.

Can I add hours to a time?

Switch to Add / subtract mode to shift any clock time by hours and minutes.