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Add or subtract two time durations in HH:MM:SS format.
Duration Operations:
Add: Total = Duration 1 + Duration 2
Subtract: Total = Duration 1 - Duration 2
Each duration is converted to total seconds. The operation is applied, then the result is reformatted to HH:MM:SS. Negative results are shown with a minus sign.
Enter times as HH:MM:SS (hours, minutes, seconds). For example, 1 hour 30 minutes is 01:30:00. Hours can exceed 23 for durations longer than a day.
Yes. The calculator treats these as durations, not clock times. You can enter 48:00:00 for a 48-hour duration.
The result is displayed with a leading minus sign (e.g., -00:15:30) to indicate the second duration was longer than the first.
Currently the calculator supports two inputs. For multiple durations, chain results: add the first two, then use the result as an input for the next addition.
The calculation is precise to the second. Milliseconds are not supported in this calculator.