Date Difference Calculator
Calculate the exact difference between two dates.
What is Date Diff?
Enter two dates and get the precise span between them, broken down into years, months, days, hours, minutes, and seconds.
How it works
Dates are compared at midnight UTC to avoid timezone drift, then decomposed into calendar-friendly units.
- Enter your input. Type or paste your input into the field above — the tool responds instantly.
- Review the result. Output updates live as you type. Everything runs entirely in your browser.
- Copy or download. Use the Copy button to grab the result, or Download to save it as a file.
Examples
Span between two dates
January 1, 2020 to August 26, 2026 breaks down as 6 years, 7 months, and 25 days — with the total also given in days, weeks, and hours.
Common mistakes
Counting the end date
Decide up front whether the last day is included. A booking from Friday to Sunday is 2 nights but 3 calendar days, depending on convention.
Frequently asked questions
Are leap years handled correctly?
Yes. Day totals account for leap years automatically, so a span crossing February 29 is counted accurately.
Why show months and total days separately?
Calendar months vary in length, so '3 months' is approximate while the total-day count is exact. Both views are useful for different calculations.
Does the timezone of the dates matter?
The tool compares dates at midnight UTC to avoid daylight-saving and timezone drift producing off-by-one-day results.