Time Duration Calculator

What it does

Calculate the duration between two clock times, or add/subtract a duration from a starting time. Handles overnight spans (22:00 → 06:00 = 8 hours) and shows the answer in hours, minutes, total minutes, and decimal hours — the format payroll systems expect.

Useful for timesheets, work shifts, and travel planning. For calendar-date differences see date difference calculator; for time zones, use time zone converter.

How to use it

1. Pick duration mode or add/subtract mode.
2. Enter start and end times (or a start time and a duration).
3. Toggle overnight if the end is the next day.
4. Read hours, minutes, decimal hours.