Date Calculator
Find the difference between two dates or add/subtract days, weeks, months, and years from a date.
How to Use the Date Calculator
Use "Difference" to find days between two dates, or "Add/Subtract" to find a future or past date.
Formula
Date difference = |Date2 − Date1| in milliseconds ÷ 86,400,000 (ms per day). Addition adjusts using JavaScript Date methods for accurate month/year handling.
Frequently Asked Questions
Does this account for leap years?
Yes. JavaScript's Date object correctly handles leap years and varying month lengths automatically.
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