Date Difference Calculator
Calculate the difference between two dates in days, months and years.
Result
Select two dates and click
"Calculate Difference".
Calculate the difference between two dates in days, months and years.
The Date Difference Calculator finds how much time lies between two dates and shows it as total days, weeks, months and years. Use it to count the days until an event, the length of a project, the gap between two bills or how long ago something happened.
The tool counts the days between the two dates. If you want to include both the first and the last day, add one day to the result.
Months have different lengths, so month and year values are rounded estimates. The total days figure is exact.
This tool compares two calendar dates and gives the result in two ways: the total number of days and a breakdown in years, months and days. Choose a start date and an end date. The end date must be on or after the start date.
The total is the end date minus the start date, so the start day is not counted. If you want to include both the first and last day, add 1 to the result.
From 1 January 2026 to 10 October 2026, the total difference is 282 days, which is 0 years, 9 months and 9 days.
Another common use is a project timeline. A project starting on 1 March and ending on 30 June is 121 days apart, or 122 days if you count both the first and last day.
Pick the dates and press Calculate Difference. The total days are shown at the top of the result.
No. It returns the end date minus the start date. Add 1 if you need an inclusive count.
The tool asks you to select an end date that is after the start date. Swap the dates to get a positive result.
It subtracts the years, months and days one by one. When the day is smaller, it borrows days from the month before the end date.