Time Calculator
Add or subtract time, measure the duration between two dates, evaluate time expressions, and convert units — all in one place.
Add or Subtract Time
Shift a start time forward or backward by hours, minutes and seconds.
24-hour format including seconds.
Hours
Minutes
Seconds
Result time
11:30:00
09:00:00 + 2h 30m 0s
Original
09:00:00
Applied
+2h 30m
Day shift
0
Duration Between Two Dates
Measure the exact time between a start and end date & time.
Total duration
08:30:00
0 days, 8 hours, 30 minutes
Days
0
Hours
8
Minutes
30
In hours: 8.50 · In minutes: 510
Time Expression
Chain durations with + and −. Use h m s units or hh:mm:ss.
Examples:
1h 30m + 45m, 2:15:00 - 0:30:00
Expression total
03:00:00
Equivalent to 3 hours
Hours
3
Minutes
0
Seconds
0
Time Unit Converter
Convert instantly between seconds, minutes, hours, days and weeks.
From
To
Converted value
60
1 hour = 60 minutes
Quick reference
1 minute
60 sec
1 hour
60 min
1 day
24 hrs
1 week
7 days
1 month (avg)
30.44 days
1 year
365.25 days
Export & share
Calculations run entirely in your browser — nothing is uploaded.
Done