Time Calculator
Add or subtract hours, minutes and seconds, or find the duration between two clock times — including overnight shifts.
Enter times to calculate.
Try:
Frequently asked questions
Can I add more than 24 hours?
Yes. Hours are not limited to a clock face. A total over 24 hours is shown with a day count as well as hh:mm:ss.
How do overnight shifts work?
Use duration mode and enable “crosses midnight”, or enter an end time earlier than the start — the calculator will add 24 hours.