Does this count include both the start and end date?

Standard day-difference calculations are exclusive, measuring the gap between two dates rather than counting both endpoints. Check the specific context (contracts, billing) since some situations require inclusive counting instead.

Does the calculator account for leap years?

Yes, any leap day (February 29) that falls within the date range is included in the day count automatically.

Why doesn't the day count divide evenly into months?

Months have different lengths (28 to 31 days), so converting a day count into a “months and days” format depends on which specific calendar months are being crossed, not a fixed division.

Days Between Dates

Calculate the exact number of days, weeks, months, and more between any two dates.

Start Date

End Date

How to use

Enter a start date and end date using the date pickers.
Click Today next to either field to quickly set it to today's date.
Use the Swap button to switch start and end dates.
Click Calculate Days to see results including total days, weeks, months, weekdays, and weekends.
Click Copy Result to copy a summary to your clipboard.

About this Days Between Dates Calculator

Counting the exact days between two dates by hand means tracking varying month lengths and any leap years crossed — simple for a short gap, error-prone for anything spanning several months or years.

Inclusive vs. exclusive counting

There are two valid ways to count days between two dates. Exclusive counting measures the gap between them (January 1 to January 5 is 4 days apart). Inclusive counting counts both the start and end date as full days (January 1 to January 5 is 5 days total). Contracts, billing periods, and hotel stays often specify which convention applies, since the difference matters for anything tied to a per-day cost or deadline.

Breaking the result into weeks and months

A raw day count (like "47 days") is often less intuitive than seeing it broken into larger units ("6 weeks and 5 days," or "1 month and 17 days"). Because months vary in length, converting a day count into months isn't a fixed division — it depends on which specific months are being crossed.

Common uses

Calculating the length of a billing period, lease, or subscription term
Determining age or duration for legal, medical, or insurance purposes
Measuring project duration between a start and end date
Calculating interest accrual periods, which often depend on exact day counts