Add or subtract time
Add or subtract hours and minutes from a start time to find the resulting time.
- Instant
- Free
- Private (processed locally)
- No sign-up
Calculate a time ± a duration
Enter a start time, choose add or subtract, then the hours and minutes: the tool shows the resulting time and the day offset.
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Start time
24-hour format.
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Add / subtract
Hours and minutes.
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Read the time
And the day offset.
Key points
- Handles crossing midnight
- Shows “the next day” / “the day before”
- 24-hour format
- Instant calculation
Example: 22:30 + 3h45
| Item | Value |
|---|---|
| Start time | 22:30 |
| Add | 3h45 |
| Resulting time | 02:15 |
| Offset | the next day |
100% local and instant calculation. No data transmitted.
Frequently asked questions
How does it work?
Pick a start time, the operation (add or subtract), then the hours and minutes. The result appears instantly, with the day offset if needed.
What happens after midnight?
The calculation stays correct: if the result passes midnight, the tool shows “the next day” (or “+2 days”), and “the day before” for a subtraction.
What is it for?
To answer “what time will it be in 3h45?”, plan a cooking time, a meeting abroad, an end of shift, etc.
Is my data uploaded?
No. The calculation is purely local and instant, with no network calls.