Subtract Time Calculator: Minus Hours, Minutes & Seconds

Subtract a duration from a specific time or find the difference between two time durations. Calculate “What time was it X hours ago?” easily.

Subtract Time Calculator

Time - Duration

Duration - Duration

Start Date & Time

Subtract Duration

Result

We perform direct arithmetic subtraction, borrowing units where necessary (e.g. borrowing 60 minutes from an hour).

$$ \text{Result} = \text{Start} - (D \times 86400 + H \times 3600 + M \times 60 + S) $$