Date & Duration Tools
Days Checker — measure the exact distance between any two dates
How to Use the Date Duration Calculator
Using this days between dates calculator takes only a few seconds. First, select your start date using the date field on the left — this is the earlier date in your calculation, such as a project start date, invoice date, or the day an event begins. Next, select your end date on the right, which is the later date you want to measure against, like a deadline, due date, or event end. As soon as both fields are filled in, the tool automatically calculates the results with no button click and no page reload required.
The results panel shows four figures at once. Total days is the full count of calendar days between your two dates. Weeks and days breaks that same span down into complete weeks plus any leftover days, which is useful for scheduling and payroll periods. Months and days gives you a calendar-based estimate, handy for calculating age, tenure, or contract length. Finally, working days counts only Monday through Friday, automatically excluding every Saturday and Sunday in the range, which makes it a fast days checker for project timelines and delivery estimates. If you enter an end date earlier than your start date, simply tap the swap icon between the two fields to flip them instantly.
Frequently Asked Questions
How do I calculate the number of days between two dates?
Enter your start date and end date into the fields above. The date duration calculator instantly works out the total number of calendar days, weeks, months, and working days between the two dates without needing to press a submit button.
Does the calculator include or exclude the start date?
The tool counts the number of full days that have elapsed between the start date and end date, so the starting day itself is treated as day zero rather than day one.
What counts as a working day in this calculator?
Working days are every day in your selected range excluding Saturdays and Sundays. Since public holidays differ by country and industry, they are not automatically removed from the working days count.
Can I use this tool to calculate dates in the future?
Yes. You can select any two valid calendar dates, whether both fall in the past, both are upcoming, or one of each, and the days checker will return an accurate duration either way.
Is this date duration calculator free to use?
Yes, it is completely free, requires no account or sign-up, and every calculation happens directly in your browser, so no dates you enter are ever sent to a server.