How many days between any two dates?

By default it counts the gap between the two dates — not including the start date, but including the end date. January 1 to January 3 = 2 days. To include both dates, add 1 to the result.

Click the "How Old Am I?" tab, enter your date of birth, and hit calculate. You'll see your exact age in days, weeks, months, hours, and a few fun facts like how many times your heart has beaten.

This answers questions like "What date is 90 days from today?" or "What was the date 6 months ago?" Pick your starting date, choose add or subtract, enter the amount, and pick days, weeks, months, or years.

Yes, automatically. Every calculation accounts for February 29 in leap years. A leap year occurs every 4 years (with some exceptions) — 2024 and 2028 are leap years, for example.

Weekdays are Monday through Friday. The calculator loops through every day in the range and counts those that fall on Mon–Fri. Useful for project timelines, business deadlines, and scheduling.

Yes — the calculator handles any date your browser supports, typically year 100 through 9999. Ancient history, famous birthdays, far-future planning — all work correctly.