Date Calculator: Add or Subtract From a Date

Select the day (1–31)
Months show both number and name for clarity
Enter a 4-digit year

Final Result 0 step

Calculation Logic: No calculation yet.

Date

DD Month YYYY

About This Date Calculator

Use this free, mobile-first Date Calculator to add or subtract years, months, weeks, and days from a starting date. Start with one step and add more only if needed. Results are always visible with a clear summary, and you can copy just the final date with one click.

How to Use (Step-by-Step)

  • Select Day and Month (shown with number and name), then enter the Year.
  • Operation 1 is shown by default. Choose Add or Subtract, then enter Years, Months, Weeks, and Days.
  • Click “+ Add Operation” to include more steps. Remove any step or Clear All if needed.
  • Click “Copy Result” to copy the final date only. The calculation logic will not be copied.

Sample Input and Output

Sample Input

  • Start Date: Day 10, Month 03 — March, Year 2025
  • Operation 1: Add 0 Years, 1 Month, 0 Weeks, 10 Days
  • Operation 2: Subtract 0 Years, 0 Months, 1 Week, 0 Days

Sample Output

  • Final Date: 13 April 2025
  • Calculation Logic: Added: 1 Month, 10 Days | Subtracted: 1 Week

Notes

  • Weeks are applied as 7 days after year/month/day adjustments.
  • Month lengths and leap years are handled by your browser’s Date engine.
  • Leave any field at 0 if not required.