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Date Difference Calculator

Calculate exact duration between two dates in days, months, and years.

Select two dates above.

How to Use This Tool

  • 1Select your starting reference date using the date picker.
  • 2Select your target end date in the second selector.
  • 3Click Calculate Difference to get full breakdowns in years, months, weeks, and total days.

How the Date Difference Calculator Works

Select a start date and an end date. The calculator determines the calendar difference and also converts the span into total days and approximate weeks.

Formula

Calculation formula The exact calendar result is calculated by comparing years, months, and days. Total days are calculated from the difference between the two dates in milliseconds, then converted to days.

Instructions

  1. Choose the start date.
  2. Choose the end date.
  3. Click Calculate Difference.
  4. Review the exact year/month/day span, total days, and total weeks.