Find elapsed time between two clocks, optionally across midnight. Fully client-side — no account, uploads, or remote storage.
Added Apr 18, 2026
Input
Result
Enter a value for mode to see your result.
Calculates the duration between two clock times, or converts a given hours/minutes/seconds combination into its total equivalents. Useful for time-tracking, scheduling, and sports timing.
17:30 − 09:00 = 8 hours 30 minutes.
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Result
2×3600 + 45×60 + 30 = 9,930 seconds = 165.5 minutes.
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Result
The calculator assumes the period spans midnight. For example, 23:00 to 01:00 is calculated as 2 hours, not −22 hours.