Find the exact number of days, weeks, months and years between any two dates. Whether you need to calculate how many days until a deadline, how long ago something happened, or how many working days are between two dates — this free calculator does it all instantly.
How to Use This Date Difference Calculator
Select your start date using the day, month and year dropdowns on the left. Then select your end date on the right. If you want to include the end date in the count tick the checkbox. Then click Calculate Difference.
What This Calculator Shows You
This calculator shows you the exact difference between two dates including total days, total weeks, total months and years, an exact breakdown in years months and days, working days between the dates, weekend days, total hours and total minutes, and the day of the week each date falls on.
When Would You Use a Date Difference Calculator
This tool is useful for calculating how many days are left until a contract expires, how many working days are between a start date and a deadline, how long someone has been employed, how many days have passed since an event, calculating age differences between two people, figuring out billing periods, and calculating school or academic term lengths.
Does This Calculator Count Working Days
Yes. This calculator automatically counts the number of working days and weekend days separately between your two dates. This is useful for project planning, payroll calculations, contract periods, and any situation where weekends do not count.
Can I Include the End Date in the Count
Yes. Tick the checkbox that says Include end date in count before calculating. This adds one extra day to the total which is useful when you want to count both the start and end date as full days such as for leave calculations or event durations.
Frequently Asked Questions
How many days between two dates? Enter your two dates in the calculator above and click Calculate Difference. The result shows the exact number of days instantly.
How do I calculate working days between two dates? This calculator automatically shows working days in the results. You do not need to do anything extra — just enter your dates and click Calculate.
How many days between dates including weekends? The total days figure includes all days including weekends. The calculator also shows working days and weekend days separately so you can see both.
Can I calculate dates in the past? Yes. The year range goes from 1900 to 2100 so you can calculate differences for historical dates as well as future dates.
Is this date difference calculator free? Completely free. No sign up, no login, no limits.
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Last updated: March 2026 · Free tool by AllTheTools.com