Date Difference Calculator

Calculate duration between two dates or add/subtract days to find a future date accurately.

Select dates to calculate

Precise Duration

Calculates exact years, months, and days between any two dates in history.

Future Planning

Easily find out what date it will be 90 days from now, or 3 months ago.

Business Ready

Includes option to count the end date, useful for contract and project durations.

How to Use the Date Calculator?

Our Date Difference Calculator is designed for simplicity and accuracy. It handles leap years and variable month lengths automatically.

1. Calculate Time Difference

  • Select the Start Date and End Date.
  • Check "Include End Date" if you want to count the last day (e.g., for inclusive leave calculation).
  • Click Calculate to see the span in Years, Months, and Days.

2. Add or Subtract Days

  • Switch to the Add / Subtract tab.
  • Enter your base date.
  • Input the number of days, weeks, or months to add or remove.
  • Instantly see the resulting future or past date.