h:m
Time Calculator
Add or subtract two lengths of time in hours, minutes and seconds.
Result…
How it's calculated
Seconds = h × 3600 + min × 60 + s Result = first ± second, then back to h, min, s
Turns both times into seconds, adds or subtracts them, and turns the answer back into hours, minutes and seconds. Minutes and seconds over 60 are fine: 90 minutes counts as 1 h 30 min. A subtraction that goes below zero shows a minus sign.
Your numbers, step by step
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