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Time Addition/Subtraction Calculator

Add or subtract hours, minutes, and seconds.
Useful for timesheets, project tracking, and cooking timers.

Result

Time Addition/Subtraction handles the base-60 math of hours, minutes, and seconds.

How it works:

  1. Convert everything to total seconds
  2. Add or subtract
  3. Convert back to hours:minutes:seconds

Conversion:

  • 1 hour = 60 minutes = 3,600 seconds
  • Total seconds = (hours × 3600) + (minutes × 60) + seconds

Examples:

  • 2:45:30 + 1:30:45 = 4:16:15
  • 8:00:00 − 5:15:30 = 2:44:30

Practical uses:

  • Adding up timesheet hours
  • Calculating total recipe/cooking time
  • Combining workout intervals

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