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Time Calculator

Add or subtract two durations and normalize hours, minutes and seconds.

How It Works

Durations are elapsed quantities, not clock times. Negative subtraction results retain a leading minus sign.

FAQs

How does this calculator work?

Durations are elapsed quantities, not clock times. Negative subtraction results retain a leading minus sign.

What assumptions should I check?

Check the units and definitions shown beside each input. Results use the values you enter.