Time Calculator ⏳
Add, subtract, multiply, divide time or find duration between two dates/times. Live results, PDF export, and clear derivation.
Tip: Switch the operation to change the input layout.
Months/years here use common approximations for mixed-unit display. See References below.
Enter up to 20 values (a new row appears once you start typing in the last row).
For subtract, we compute: first row − (sum of the others).
Multiply: time × factor ·· Divide: time ÷ factor.
We calculate to the minute/second depending on your device/browser support.
= 0 h 0 min 0 sec
Total seconds
0
Total minutes
0
Total hours
0
Total days
0
≈ months (30.5 d)
0
≈ years (365 d)
0
🧮 Step-by-step derivation
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References / constants used: 60 s = 1 min; 60 min = 1 h; 24 h = 1 d; 7 d = 1 w; 1 mo ≈ 30.5 d; 1 y = 365 d. Mixed-unit “years/months/days” are approximations unless using the calendar modes.