Add or subtract hours and minutes from a time, or find the duration between two times. Handles times that cross midnight.
Enter a start time and the hours and minutes to add or subtract. The result wraps automatically at midnight.
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Enter a start and end time to find the elapsed duration. If the end time is earlier, the calculator assumes it falls on the following day.
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A time calculator works with clock times rather than dates — handy for shift planning, timesheets and working out how long a task took. It correctly handles times that cross midnight.
Times are converted to minutes since midnight, the arithmetic is done in minutes, and the result is converted back to HH:MM. The 24-hour clock wraps at 1440 minutes (midnight).
Use the 24-hour picker. 2 PM is 14:00; entering 2:00 is read as 02:00 (early morning). The 24-hour format removes AM/PM ambiguity.
For the duration tool, an end time earlier than the start is treated as the following day, so 22:00→02:00 correctly gives 4 hours.