Everyday tool
Date Difference Calculator
Pick two dates to see exactly how far apart they are.
—Years, months, days
—Total days
—Total weeks
—Total months
About the Date Difference Calculator
Date Difference calculates the exact gap between two dates in days, weeks, months and years. People use it to count the days until an event, measure the length of a project, work out how long something has been running, or find the number of days between two invoices.
The tool counts calendar days, including leap days, and also breaks the gap into years, months and days. Months have unequal lengths, so a gap of "one month" is calculated from calendar months, not a fixed 30 days. If you need only working days, use the Business Days Calculator instead.
How to use it
- Choose the From date.
- Choose the To date.
- Press Calculate difference.
- Read the result in total days and in years, months and days.
Tips and good to know
- Swap the dates if you get a negative-looking result; the tool will still show the gap.
- The end date may or may not be counted in contracts.
- Use the Age Calculator for birthdays.
Frequently asked questions
Does it include both start and end dates?
It counts the gap between them. Add one day if you need both inclusive.
Are leap years handled?
Yes.
Can I calculate across centuries?
Yes, within the range your browser supports.