Time Subtraction Calculator

Subtract hours, minutes, and seconds from a starting time. Find what time it was before a given duration.

Start time

Subtract

hms

Enter a start time and duration.

How It Works

Subtract hours, minutes, and seconds from any start time. If the result goes before midnight, the calculator shows "−1 day" (previous day).

Example: 5:00 PM − 3h 30m = 1:30 PM

Last updated: 2026-08-08