Add or subtract hours, minutes and seconds, or find the duration between two times.
Frequently Asked Questions
How do I add or subtract hours and minutes?
Convert each time to total seconds, add or subtract them, then convert the result back to hours, minutes and seconds.
How do I calculate the duration between two times?
Subtract the start time from the end time in seconds. If the result is negative, the end time is on the next day, so add 24 hours (86,400 seconds).
Can this calculator handle times that cross midnight?
Yes, the Duration Between Times mode automatically adds a day when the end time is earlier than the start time.