Time Calculator
Find the time between two clock times, add or subtract hours and minutes, and total several durations.
Time difference
Turn this on to calculate across several days. Times are treated as wall-clock times, so daylight-saving shifts are not applied.
9 h 0 min 0 s
- Total hours
- 9
- Total minutes
- 540
- Total seconds
- 32,400
About Time Calculator
Find the elapsed time between two clock times, shift a time by hours, minutes and seconds, or total several durations.
Choose time difference, add / subtract or sum durations. Turn on Include dates to calculate across several days with a date for each time.
Use the result to total work hours, check an overnight shift or plan when a task finishes, then copy or download it with its inputs.
The calculation or rendering runs in this browser tab. Copy, download and share actions make the chosen output available outside this tab.
Worked example
- Input / settings
- Start 22:00:00, end 06:30:00, dates off
- Action
- Calculate the time difference
- Result
- 8:30:00 (8 h 30 min 0 s); the end is counted on the next day.
- Input / settings
- 1:30 + 2:45 − 0:15
- Action
- Sum durations
- Result
- 4:00:00 (4 h 0 min 0 s).
Scope and limits
- Times use whole seconds. Without dates, an end earlier than the start is counted on the next day; with dates, an earlier end gives a negative result.
- Calculations use wall-clock time with 24-hour days, so daylight-saving transitions are not applied. Dates are limited to years 0001–9999.
- Duration fields accept whole numbers from 0 to 1,000,000, and blank fields count as 0. Sums allow up to 50 rows.
Frequently asked questions
- How is a total over 24 hours shown?
- Durations are shown as cumulative hours, such as 26:30:00, with the day breakdown 1 d 2 h 30 min next to it. Use Date Calculator to add or subtract calendar days.
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