Date Add/Subtract Calculator
Free date calculator to find a future or past date by adding or subtracting any combination of days, weeks, months, and years.
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Calculate Future and Past Dates
Need to find a deadline 90 days from now? Or what date was 6 months ago? Our date calculator adds or subtracts any combination of days, weeks, months, and years from any starting date.
Date Arithmetic
Date calculations are complex because months have different lengths, years can be leap years, and adding months doesn't always result in a valid date (like adding 1 month to January 31). Our calculator handles all these edge cases correctly.
Example
March 15 + 90 days = June 13Why Use This Calculator?
Accuracy
Automatically handles months of different lengths and leap years.
Flexibility
Add or subtract in days, weeks, months, or years.
Planning
Perfect for calculating deadlines and timelines.
How to Calculate
Applications
Deadlines
Calculate when projects or payments are due.
Contracts
Determine contract expiration dates.
Events
Plan events a certain time in the future.
Medications
Calculate when to renew prescriptions.
Frequently Asked Questions
If the resulting month doesn't have that day, it uses the last day of the month. For example: January 31 + 1 month = February 28 (or 29 in a leap year).