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A time calculator adds, subtracts, or converts time values in hours, minutes, and seconds. Used for timesheet calculations, trip planning, cooking, sports timing, and any situation requiring arithmetic on time values rather than standard numbers.

Trin-for-trin guide

1. 1Convert all to seconds for arithmetic: hours×3600 + minutes×60 + seconds
2. 2Perform the arithmetic operation
3. 3Convert result back: divide by 3600 for hours, remainder/60 for minutes, etc.
4. 4For duration across midnight: add 24 hours if end is before start

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