Date Calculator
Add or subtract days, months, and years from any date. Calculate future and past dates instantly. Perfect for planning and scheduling.
Result Date
Start Date: -
Operation: -
Result: -
How to use the Date Calculator
- Choose the start date.
- Enter days, months and/or years.
- Choose Add or Subtract.
- Click Calculate to see the resulting date and weekday.
Formula used
Worked example
From 30 October 2026
+ 90 days = 28 January 2027
+ 6 months = 30 April 2027
− 1 year = 30 October 2025
Common uses
Find a cheque's 3-month validity date, a 90-day return window, a medicine expiry, a probation end date or a 45-day notice period. Adding months is not the same as adding 30 days: 31 January + 1 month lands at the end of February, because February is shorter.
Tips for accurate results
- Adding months keeps the same day number where possible.
- For working days only, use the business days calculator.
- Double-check legal deadlines with the exact rule.
Frequently Asked Questions
Enter today's date and add 90 days.
Yes.
Yes, choose Subtract.
Related Calculators
Content reviewed by Vinod, Easy Smart Calculator · Last updated October 2026
How This Calculator Works
Enter your start date and the number of days, months, or years you want to add or subtract. The calculator instantly shows the new date and which day of the week it falls on.
Use Cases
- Project Planning: Calculate project end dates
- Scheduling: Plan events weeks or months ahead
- Deadlines: Calculate submission deadlines
- Age Calculation: Find dates in the past
- Loan Terms: Calculate maturity dates