⏰Time Calculator: Add Time & Time Between
Add or subtract hours and minutes from any time, or find out how long it is between two times.
That's a stretch of
8h 30m
8.50 hours · 510 minutes
If the end time is earlier than the start, I assume it runs past midnight — handy for night shifts!
How it works
Every time is turned into minutes after midnight. For time between, we subtract start from end; if the end is earlier, we assume it runs past midnight and add 24 hours. For add / subtract, we add the hours and minutes and wrap around the clock, telling you if it lands on a different day.
Worked example
A shift runs from 9:00 AM to 5:30 PM.
- 9:00 AM = 540 minutes, 5:30 PM = 1,050 minutes
- 1,050 − 540 = 510 minutes
- 510 ÷ 60 = 8 hours 30 minutes (8.5 hours)
Starting at 10:15 PM and adding 3h 45m gives 2:00 AM, 1 day later.
Questions people ask
Just enter the start and end times. If the end time is earlier than the start, the calculator assumes the shift runs past midnight.
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Last updated September 28, 2026. These results are friendly estimates to help you plan — always double-check before buying or making big decisions.