Date Difference Calculator

Days between two dates, age calculator, or add/subtract days from a date.

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What can you use this for?

  • Age calculation — exact age in years, months and days
  • Deadlines — how many days remain until a target date?
  • Vacation / trip length — days, weeks, working days
  • Pregnancy & due date — weeks since the last menstrual period
  • Anniversaries — how many days have we been together?

How is the difference calculated?

The calculator returns the difference as a calendar Y/M/D breakdown (e.g. 2 years, 3 months and 14 days). Months have variable lengths — January is 31, February 28 or 29 — so the Y/M/D view is exact while the total-months figure is averaged.

The Include end date option adds one day — useful for hotel nights or contract periods where both the start and end day count.

Working days

Enable Working days only to exclude weekends (Saturday and Sunday). Public holidays are not subtracted automatically — they vary by state and country. As a rough estimate, ~250 working days per year is a typical baseline.