Date Difference Calculator
Pick a start date and an end date to see the exact number of days, weeks, months, and years between them.
Pick two dates to compare
Enter a start date and an end date and the difference will appear here.
How to use this calculator
Enter a start date and an end date. The calculator returns the total number of days between them, along with weeks, approximate months, approximate years, and a calendar breakdown of years, months, and days.
This tool is helpful for project planning, contract durations, tracking how long ago something happened, or simply comparing two dates.
Examples
- How many days between January 1 and December 31?
- How many days are left in the year?
- How many days until Christmas?
- How many business days are between two dates?
Frequently asked questions
How is the difference calculated?
The tool counts the calendar days between the two dates and converts the total into weeks, approximate months, and years.
What if the end date is before the start date?
The tool still returns the correct number of days. The result is shown as an absolute value, and the calculator notes that the dates were reversed.
Is the month calculation exact?
The month value is an approximation based on an average month length. The calendar breakdown (years, months, and days) is computed using calendar logic for a more exact view.
Does this account for leap years?
Yes. The calendar difference uses real calendar arithmetic, so leap years are handled automatically.
Can I count only business days instead?
Yes. Switch to our Business Days Calculator to exclude weekends.