Date Calculator
Count the exact number of days between two dates — including business days — or jump forward and backward by any mix of years, months, weeks and days.
Dates are counted as whole calendar days, leap years included. The business-day count walks day by day between the two dates and skips Saturdays and Sundays — it does not account for federal holidays, which vary by employer and state.
When adding or subtracting, months and years are applied first (using the calendar, so January 31 plus one month lands on the last day of February), then weeks and days. That ordering matches how deadlines and contracts are usually written.
Worked examples
Countdown to a deadline
From September 17 to December 25 is 99 calendar days — about 14 weeks.
→ 99 days
90-day warranty
Add 90 days to a purchase date to find the exact day coverage ends.
→ Use “Add / subtract” mode
Business days
30 calendar days contain roughly 21–22 business days, depending on where weekends fall.
→ Counted automatically