Time Calculator
Add or subtract hours, minutes, and seconds from a time, or measure duration between two clock times.
Time calculator
Result time
11:30:00
Same day.
Frequently Asked Questions about the Time Calculator
What can this time calculator do?
It adds time to a start time, subtracts time from it, or calculates the duration between two clock times in hours, minutes, and seconds.
How does it handle crossing midnight?
When the result passes 00:00, the calculator reports how many days forward or backward you crossed and wraps the clock time to a 24 hour format.
Does the duration mode handle overnight shifts?
Yes. If the end time is earlier than the start time, the calculator assumes the end time is on the next day and returns the elapsed duration.
What time format should I use?
Use 24 hour HH:MM input (for example 14:30). Results are shown as HH:MM:SS.
Can I add seconds, not just minutes?
Yes. The add and subtract modes accept hours, minutes, and seconds independently, so you can shift a time by any combination.