Time Addition Calculator

Add hours, minutes, and seconds to a starting time. Find what time it will be after adding a duration.

Start time

Add

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Enter a start time and duration.

How It Works

Add hours, minutes, and seconds to any start time. If the result passes midnight, the calculator shows "+1 day".

Example: 9:00 AM + 3h 45m = 12:45 PM

Last updated: 2026-08-08