Time Calculator
Add or subtract hours and minutes from a time of day, with automatic wraparound past midnight.
- Free to use
- Accurate results
- No registration required
- Works on all devices
Enter a start time, hours and minutes, and whether to add or subtract to find the resulting time of day.
Use 24-hour HH:MM format, e.g. 09:00 or 17:45.
Your result
11:30
Result time
Day changesame day
AI explanation
Formula
Result time = start time ± (hours × 60 + minutes), wrapped to a 24-hour clockWorked example
Adding 2h 30m to 23:00
| Field | Value |
|---|---|
| Start time (24-hour) | 23:00 |
| Hours | 2 |
| Minutes | 30 |
| Operation | add |
| Result time | 01:30 |
| Day change | +1 day |
Assumptions
- Times are 24-hour clock values with no specific calendar date attached — the "day change" output shows whether the result crosses into the next or previous day, not a specific date.
Frequently asked questions
What happens when the result crosses midnight?
The time wraps around a 24-hour clock, and the "day change" output tells you whether the result falls on the next day, the previous day, or the same day.
Can I subtract time instead of adding?
Yes — choose "Subtract" to go backward from the start time instead.
Is this the same as the Time Duration Calculator?
No — this calculator finds a new time by adding/subtracting a duration. The Time Duration Calculator instead finds the duration between two given times.