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Calculators » Date & Time » Time Addition & Subtraction

Our online tools will provide quick answers to your calculation and conversion needs. On this page, you can add/ subtract two time durations specified in hours, minutes, and seconds which is very useful for adding hours worked on a project.

Result window

- Clock time calculator: Add/ subtract hours and minutes to find time on clock
- Timesheet calculator: Add two or more time-intervals for payroll and billing

**Steps for adding time**

- Add the seconds. If the sum is >= 60, subtract 60 and carry forward 1 to minutes addition.
- Add the minutes and the carry from seconds addition, if any. If the sum is >= 60, subtract 60 and carry forward 1 to hours addition.
- Add the hours, and the carry from minutes addition, if any.

**Steps for subtracting time**

- Subtract the seconds. If the difference is < 0, add 60 to it borrowing 1 from the minutes.
- Subtract the minutes after regrouping, if there was a borrow in the previous step. If the difference is < 0, add 60 to it borrowing 1 from the hours.
- Subtract the hours after regrouping, if there was a borrow in the previous step.

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