Date Difference Calculator
Calculate days between two dates. Start and end date picker with exact day count.
How to Use
Enter your values in the fields above and click Calculate to get instant results. All computations run locally in your browser. No data is ever uploaded or stored.
Related Calculators
Calculating Date Differences
CalcSolver's date difference calculator counts the exact number of days between any two dates, accounting for varying month lengths and leap years. It displays the result in days, weeks, months, and years — giving you multiple perspectives on the time span.
From January 1 to December 31 of the same year = 364 or 365 days (365 in non-leap years, 366 in leap years). Leap years occur every 4 years, except century years not divisible by 400 (so 2000 was a leap year, but 1900 was not).
Common uses include: calculating project deadlines, tracking pregnancy milestones, determining contract durations, and planning event timelines. When counting business days, exclude weekends and holidays — our calculator shows total days for maximum flexibility. Use CalcSolver's age calculator for birth-date calculations and the date calculator for adding/subtracting days from a date.
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Frequently Asked Questions
How do I calculate days between two dates?
Enter the start and end dates. The calculator counts every day between them, accounting for varying month lengths and leap years, and displays the difference in days, weeks, months, and years.
Does the calculator include both the start and end dates?
The calculator counts the number of days between the two dates. Whether to include both endpoints depends on your specific use case — the total day count is shown for flexibility.
How are leap years handled?
Leap years (divisible by 4, except centuries unless divisible by 400) have 366 days instead of 365. The calculator automatically accounts for leap years in all calculations.