How does the date calculator work?

Enter a starting date and choose to add or subtract days, weeks, months, or years. The calculator handles month lengths and leap years automatically.

Does it account for leap years?

Yes, the calculator correctly handles leap years when calculating dates that span February 29th.

Can I subtract dates to go backward?

Yes! Choose 'Subtract' mode to calculate past dates from your starting point.

No. All calculations happen locally in your browser. We do not store or transmit any information.

Date Calculator

Add or subtract days, weeks, months, or years from any date. Perfect for deadline planning, project scheduling, or finding important dates.

Calculate Your Date

Choose a starting date and add or subtract time.

Starting Date

What do you want to do?

How many?

Time Unit

How It Works

This date calculator allows you to add or subtract days, weeks, months, or years from any date between 1900 and 2100.

Select a starting date (1900-2100)
Choose to add or subtract time
Enter the amount and select the time unit
Click Calculate to see your result. Subsequent changes will update the result automatically.

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Common Uses

Deadline Planning

Calculate when a project deadline falls by adding weeks or months to your start date.

Contract Dates

Determine expiration dates for leases, subscriptions, or warranties.

Event Planning

Find the perfect date for parties, vacations, or milestones months in advance.

Frequently Asked Questions

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