Time Calculator
Add or subtract hours, minutes, and seconds from a clock time, including day changes.
Enter values
Result
About this tool
Add or subtract a duration from a clock time and see how many days the result moves forward or backward.
This tool does not use a calendar date, so it does not calculate weekdays or month changes. Use Date & Day Calculator for calendar dates.
Frequently asked questions
Can I add more than 24 hours?
Yes. The result includes the number of days moved.
Can it add seconds?
Yes. Hours, minutes, and seconds are supported.
Is this a time zone converter?
No. It performs arithmetic on one clock time without changing zones.
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