Date Calculator
Free online Date Calculator.
Calculator
How to Use
- Enter the required values
- Click Calculate to see the result
- Review the detailed output
Formula
Result Date = Start Date +/- Days/Weeks/Months/Years. Handles month boundaries, leap years, and year transitions automatically.
Example Calculations
Add Days
Input: Start: January 1, 2026 + 90 days
Result: April 1, 2026
Subtract Weeks
Input: Start: December 25, 2026 - 4 weeks
Result: November 27, 2026
Business Days
Input: Start: October 1, 2026 + 20 business days
Result: October 29, 2026
About This Calculator
Free online date calculator. Calculate instantly in your browser with our easy-to-use tool. No sign-up required.
Our date calculator is free, easy to use, and provides instant results. All calculations are performed in your browser for privacy and speed.
Related Calculators
Frequently Asked Questions
How do I add days to a date?
Enter the start date and number of days. The calculator handles month boundaries, leap years, and year transitions.
How many business days between dates?
Use the business days calculator to count weekdays, excluding weekends and holidays.
Can I calculate weeks between dates?
Yes, calculate total days and divide by 7, or use the calculator for results in weeks, days, or months.
What is the Julian date?
A continuous day count since January 1, 4713 BC, used in astronomy and computer systems.
How do time zones affect dates?
Results can differ by a day across time zones. Always specify the time zone for precision.