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Time Calculator

Add or subtract durations in days, hours, minutes, and seconds, or convert a single duration between time units — all in your browser.

How to use Time Calculator

  1. Choose add/subtract or convert.
  2. Enter the durations or value and unit.
  3. Read the normalized result and totals.

Frequently asked questions

Does it handle negative results?
Yes — subtracting a larger duration shows a signed result and the totals reflect the negative value.

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