Calculator
Date Calculator
Calculate the difference between two dates, add or subtract days/weeks/months/years, and discover day-of-week, week number, leap year status, and more.
Frequently Asked Questions
Find the exact number of days, weeks, months, and years between any two dates. Add/subtract time or look up day of week and week number.
Business days exclude weekends (Saturday and Sunday). Only Monday through Friday are counted.
A year is leap if divisible by 4, except centuries — unless also divisible by 400. Checked automatically.
Yes, completely free with no registration. All calculations happen in your browser.