🕒 Time Calculator

Calculate time differences or add/subtract durations.

Calculation Type:

Start Time:

End Time:

If end time is on the next day, the duration will be calculated accordingly.

How to Use the Time Calculator

This tool helps you calculate time differences and project future or past times:

Find Duration Between Times: Select this option. Enter a Start Time and an End Time (using hh:mm or hh:mm:ss format). The calculator determines the duration, correctly handling cases where the end time is on the next day.
Add/Subtract Duration to Time: Select "Add" or "Subtract". Enter a Start Time, then specify the Duration in hours, minutes, and seconds. The calculator finds the resulting time.

Understanding Time Calculations

The calculator operates within a 24-hour cycle.
When calculating duration, if the end time is earlier than the start time, it assumes the end time is on the following day.
Adding or subtracting durations wraps around the 24-hour clock (e.g., 23:00 + 2 hours = 01:00).