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Free calculator tool
Date Difference Calculator
Compare two dates in years, months, weeks, total days and Monday-to-Friday days, with optional inclusive counting.
Browser-side processing No sign-up Free to use
Choose a start date to compare it with the end date.
How it works
A direct path from input to result.
Adjust the options
Use clear controls to choose exactly how the result should be produced.
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Take the finished result with you. No account or saved project required.
About this tool
Use Date difference with confidence.
The difference between two dates can be expressed as a calendar span or as a total number of elapsed days. Both are useful: a calendar span is natural for anniversaries, while total days are clearer for deadlines, bookings and data analysis.
By default the end date is excluded, matching elapsed-time counting. Turn on inclusive counting when both boundary dates should count, such as every date covered by a reservation or campaign.
Common uses
Measure the time available between a start date and a milestone or delivery date.
Count total dates with or without the departure or ending date included.
See how many Monday-to-Friday dates occur in the range before applying location-specific holidays.
Practical tips
January 1 to January 2 is one elapsed day, but two calendar dates when both boundaries are included.
The Monday-to-Friday figure does not remove public holidays or organization-specific closures.
A result such as one month can represent 28, 29, 30 or 31 days depending on the dates.
Questions about Date difference
Why is the end date excluded by default?
Elapsed time measures completed intervals. From the start of January 1 to the start of January 2, one full day has elapsed.
What happens if I enter the later date first?
The calculator shows the absolute span and identifies whether the second date is before or after the first.
Are holidays removed from the weekday total?
No. Use the Business Days Calculator and provide the relevant holiday dates when you need a working-day result.