Date Difference Calculator
Calculate the exact number of days, weeks, months, and years between any two dates. Free, instant, and accurate date calculations.
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How to Calculate Date Differences
Pick Dates
Select your start date and end date using the date pickers.
View Results
See the exact difference in days, weeks, months, and years instantly.
Swap Dates
Use the swap button to quickly reverse the start and end dates.
Why Use Our Date Difference Calculator?
Multiple Units
See results in days, weeks, months, and years all at once.
Instant Results
Results update immediately as you change either date.
Completely Free
No limits, no signup. Calculate as many date differences as you need.
Private & Secure
All calculations happen in your browser. No data is sent anywhere.
Frequently Asked Questions
Does this account for leap years?
Yes! The calculator automatically accounts for leap years and varying month lengths in all calculations.
Can I calculate business days?
This calculator shows total calendar days. For business days, try our Date Add/Subtract tool which supports weekday calculations.
What date range can I calculate?
You can calculate the difference between any two dates from year 1 to year 9999.
How are months calculated?
Months are calculated as full calendar months between dates, accounting for varying month lengths.
Is my data sent anywhere?
No. All calculations happen locally in your browser. No date data is ever sent to any server.