Time Duration Calculation Cheat Sheet

The core rule for calculating time duration across midnight, for quick reference.

Brekzy Team Published September 8, 2026

The core rule for calculating time duration across midnight, for quick reference. For the full explanation, see How to Calculate Time Duration.

If the end time is on the next day, add 24 hours to it before subtracting the start time.

11:00 PM to 2:00 AM: 26:00 − 23:00 = 3 hours

Use the Time Duration Calculator

The Time Duration Calculator calculates duration between any two times instantly, including across midnight.

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Time Duration Calculator

Why does my time subtraction give a negative number?

The range likely crosses midnight; add 24 hours to the end time before subtracting.

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