⏱ Free Date Calculator

Date Calculator

Add or subtract days, weeks, months or years from any date. Calculate the exact future or past date instantly.

Resulting Date
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Enter your date and calculate.
— ISO Date
— Day
— Month
— Year

What Is a Date Calculator?

A date calculator is an online tool that helps you determine a future or past date by adding or subtracting a specific amount of time from a starting date.

Instead of manually counting calendar days, you can enter a starting date, choose the direction of the calculation, select a time unit and instantly find the resulting date.

This date calculator can be useful for deadlines, project planning, appointments, vacations, contracts, subscriptions, school dates, payment schedules, anniversaries and other date-based planning.

How to Use This Date Calculator

  • Choose your starting date.
  • Select Add to move forward in time.
  • Select Subtract to move backward in time.
  • Enter the amount of time.
  • Choose days, weeks, months or years.
  • Click Calculate Date.
  • The exact resulting date and weekday will appear instantly.

What Can You Calculate?

Frequently Asked Questions

What is a date calculator?

A date calculator determines a future or past date by adding or subtracting days, weeks, months or years from a starting date.

How do I calculate a date after a certain number of days?

Enter the starting date, choose Add, enter the number of days, keep Days selected and click Calculate Date. The resulting date and weekday will be displayed.

Can I subtract days from a date?

Yes. Select Subtract and enter the amount of time you want to move backward from the starting date.

Can I add or subtract months and years?

Yes. The calculator supports days, weeks, months and years. Calendar calculations automatically account for different month lengths.

Is this date calculator free?

Yes. The DaysCounter date calculator is free to use online and works directly in your browser.