Date Calculator
Calculate the difference between two dates, add or subtract days, or count business days.
Loading tool...
Date Difference
Calculates the exact time between two dates in years, months, days — plus total days and weeks. Leap years are handled automatically.
Add or Subtract Days
Find the date a given number of days before or after any date. Example: 2026-01-01 + 100 days = 2026-04-11.
Working Days Calculator
Business days mode counts only Monday through Friday between two dates, excluding weekends. Public holidays are not excluded, as they vary by country.
Frequently Asked Questions
Enter both dates in Date Difference mode. The calculator shows the exact difference in years, months and days, plus total days and weeks.
Use Add Days mode: enter a start date and the number of days. For example, 2026-01-01 plus 100 days is 2026-04-11.
Business days exclude Saturdays and Sundays only. Public holidays are not excluded because they differ by country and region.
Embed this tool on your website
Free to use — copy this code onto your site. It stays up to date automatically and includes a link back to CalcSun.