Use this free online date difference calculator to find exactly how much time falls between two dates — as a total day count, a years/months/days breakdown, and in weeks.
How to Use the Date Difference Calculator
Select the "Start Date".
Select the "End Date".
Click "Calculate Difference" to see the exact years, months, days, weeks, and total days between them.
Frequently Asked Questions
The calculator compares the calendar year, month, and day of both dates directly, borrowing a month or year when needed (e.g. if the end day is earlier in the month than the start day), so the result matches how people naturally describe a gap in time.
The total day count is the number of full days between the two dates (End Date minus Start Date), so choosing the same date for both gives a difference of 0 days.
Yes, it's completely free and requires no sign-up.