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About the Time Calculator
The Time Calculator on truecalculator.net computes differences between two times, adds or subtracts durations, and converts between hours, minutes, and seconds. You get results in your chosen format, ready to copy into schedules, timesheets, or plans.
Time math uses base-60 arithmetic: the calculator converts every input to total seconds, performs the operation, then converts the result back to hours, minutes, and seconds. Enter your start time or duration, then add or subtract another period, or pick two clock times to find the elapsed interval. For overnight spans, such as 9:00 PM to 5:00 AM, the tool accounts for the day change automatically. Double-check AM and PM entries to avoid twelve-hour errors.
- Choose an operation: add, subtract, or find the difference between two times.
- Enter your times or durations in the input fields.
- Press calculate and read the result in hours, minutes, and seconds.