Calculator Tools
Free Online Date Difference Calculator
Enter a start date and end date to instantly calculate the exact number of days, weeks, months and years between them.
How to use the date Difference Calculator
- Select a start date and an end date.
- Click 'Calculate difference' — or use 'Set end date to today' for a quick countdown.
- View the result broken down as years/months/days, plus total days, weeks and months.
- Change either date at any time to recalculate.
Example
From 1 January 2026 to 29 July 2026 is 6 months, 28 days — or 209 total days.
Why calculate the difference between two dates?
Planning events, tracking deadlines, calculating contract lengths, or figuring out how many days until a trip all require date math that's easy to get wrong by hand, especially across different month lengths and leap years.
Exact and instant
This calculator handles all the edge cases — leap years, varying month lengths, and date order — so you get an accurate answer immediately, broken down however you need it.
Frequently asked questions
The day count reflects the number of days between the two dates; the start date itself is counted as day zero.
Yes, enter any future end date to see a countdown in days, weeks and months.
The tool will show an error asking you to make sure the start date comes first.
Yes, the calculation is based on actual calendar dates, so leap years are handled automatically.