Date & Time Calculator
Time Calculator
Add or subtract hours and minutes from a time of day.
Operation
Resulting time
12:15 PM
How it works
Enter a starting time and a duration to add or subtract. The result wraps around midnight automatically — adding 3 hours to 11:00 PM correctly gives 2:00 AM the next day.
Formula
Resulting time = Start time ± Duration, wrapped to a 24-hour clock
Example
9:30 AM plus 2 hours 45 minutes is 12:15 PM.
Frequently asked questions
Does this tell me the date, not just the time?
No — this only tracks the time of day and wraps around midnight. If you also need to know which calendar date you land on, use the Date Calculator alongside this one.
Can I subtract past midnight?
Yes — subtracting a duration that goes before midnight correctly wraps to the previous day's time.