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Date Calculator

Switch between date difference mode and add/subtract mode to measure a gap or shift a date by years, months, weeks, and days.

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Total days

456

Calendar span

1 / 3 / 1

How it works

Difference mode measures the gap between two dates. Add/subtract mode shifts a base date by calendar years, months, weeks, and days.

Calculation notes

  • Day counts are computed in UTC to reduce timezone drift.
  • Years and months are applied before weeks and days.
  • Including the end day adds one extra day to the final count.

Frequently asked questions

Does adding one month always mean 30 days?expand_more

No. The calculation follows the real calendar month length.

When should I include the end day?expand_more

Use it when the final day should count, such as trips, rentals, or deadlines that include the last date.

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