Date Difference Calculator

Find the number of days, weeks, and months between two dates. Free date duration calculator for planning projects, events, and deadlines.

Start Day of Year (1-365)

End Day of Year (1-365)

Result

Does this calculator count the start or end day?▼

This calculator counts the gap between two dates (end minus start), excluding the start day. Add 1 if you want an inclusive count.

How are weeks and months derived?▼

Weeks are days divided by 7. Months use an average of 30.44 days (a 365.25-day year over 12). Both are approximations.

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