Calendar Kit
Free Date Calculator — Days Between Dates & Date Math
Calculate days between dates, add/subtract days/weeks/months/years, count business days, and create countdowns. Free, no sign-up.
FAQ
How accurate is the date calculator?
It uses native JavaScript Date APIs and correctly handles leap years, varying month lengths, and all edge cases.
Does the business days calculator exclude holidays?
Currently it excludes weekends (Saturday and Sunday). Public holidays are not excluded.
Can I calculate my age?
Yes, enter your birth date and today's date in the Days Between mode to see your exact age.
Is this tool free?
Yes, completely free with no sign-up or usage limits.