Date Calculator
Add or subtract days, weeks, months, and years to or from any date — find exact future or past dates for deadlines, anniversaries, project timelines, and more.
Duration to Add
Quick Presets
How to Use the Date Calculator
- 1
Enter your start date using the date picker. This is the date you want to calculate from. Use the quick preset buttons for the most common calculations like adding 30 days or 90 days.
- 2
Enter the number of years, months, weeks, and days you want to add or subtract. You can combine multiple units — for example add 1 year, 2 months, and 15 days all at once.
- 3
Select the Add to Date or Subtract from Date tab depending on whether you want a future or past date. Click Calculate to see the result instantly.
- 4
Download the free PDF report to save your date calculation for contracts, deadlines, project planning, or personal reference.
Example Calculation
Inputs: Start Date: March 20, 2026 | Add: 1 year, 2 months, 15 days
Result: June 4, 2027 (Friday)
Total Days Added: 441
Total Weeks: 63 weeks, 0 days
Quick Presets from March 20, 2026:
+30 days: April 19, 2026 (Sunday)
+90 days: June 18, 2026 (Thursday)
+6 months: September 20, 2026 (Sunday)
+1 year: March 20, 2027 (Saturday)
−30 days: February 18, 2026 (Wednesday)
−90 days: December 20, 2025 (Saturday)
Frequently Asked Questions
Disclaimer: This report is generated for informational purposes only. Date calculations are based on the Gregorian calendar and account for varying month lengths and leap years. Results are for reference only and should be verified for legal or contractual purposes.