Last Updated: April 12, 2026
Date Calculator
Find the difference between two dates or add/subtract days from a date.
π How We Calculate — Learn about our calculation methodology, data sources, and quality standards.
Frequently Asked Questions
How many days are between two dates?
Enter both dates in the calculator above to get the exact number of days, weeks, and months between them. The calculation accounts for varying month lengths and leap years.
How do I count business days?
Business days exclude weekends (Saturday and Sunday). This calculator has a business days option that counts only Monday through Friday between your dates.
How do I add days to a date?
Use the Add/Subtract tab. Enter your starting date and the number of days to add. The calculator gives you the resulting date, accounting for month lengths and leap years.
What is a leap year?
A leap year has 366 days (February 29). It occurs every 4 years, except for century years not divisible by 400. So 2024 is a leap year, 2100 is not, but 2000 was.