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Time & Date · Updated 2026

Add / Subtract Time

Add or subtract hours and minutes from a time and get the result, in 24-hour format.

Enter the time and span

h
min

Pick the start time, add or subtract, and set the hours and minutes. 24-hour format.

=Result time
12:15
Start time09:30
Add+ 2 h 45 m
Day changesame day

Precise calendar calculations. Everything is computed instantly in your browser, no account, no data sent. Leap years and Gregorian calendar rules are handled.

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iHow it is calculated

Enter a start time, choose the operation and set the hours and minutes. The time “wraps” within 0–24, and if it crosses midnight the day change is shown:

new time = (start time ± hours:minutes) mod 24h

09:30 + 2 hours 45 minutes = 12:15. 22:50 + 80 minutes = 00:10 (next day).

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?Frequently asked questions

How do I add hours and minutes to a time?

Enter the start time, tap “Add” and set the hours and minutes. For example, 09:30 + 2 hours 45 minutes = 12:15.

How do I subtract hours from a time?

Tap “Subtract”. 09:30 − 2 hours = 07:30. If the result crosses midnight, the day change is shown.

What happens if I cross midnight?

The time “wraps” within 0–24, and the calculator shows whether the result falls on the next day (+1 day) or the previous one (−1 day).

Can I add only minutes?

Yes, leave hours at 0 and set only minutes. 22:50 + 0 hours 80 minutes = 00:10 (next day).

How do I calculate an arrival time?

Enter the departure time and add the journey duration. 14:20 + 3 hours 40 minutes = 18:00.

Is the format 24-hour?

Yes, the 24-hour format (00:00–23:59) is used, no AM/PM — the standard written form in the UK for timetables and schedules.

What is adding time used for?

Arrival times, work shifts, cooking times, schedules and any addition or subtraction of time in hours and minutes.

Does it differ from calculating worked hours?

Yes. Here you add/subtract a span from a time. For worked hours (start, end, break) use the work-hours calculator.

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