Date Calculator

Two handy modes: calculate the difference between two dates in days, weeks and months, or add (or subtract) a number of days to a given date.

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Frequently Asked Questions

How are months calculated?+
Months use the average month length (~30.44 days), which is accurate for planning purposes.
Can I subtract days?+
Yes — enter a negative number of days to go backwards from the start date.

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Date Calculator — free online date calculator, days between dates, date difference, add days to date, date add subtract, days calculator. No signup required. Works in your browser.