Days Between Dates Calculator

How to count the days between two dates

The number of days between two dates is the difference in calendar days. The calculator handles the tricky parts for you — month lengths and leap years — and shows the result as days, weeks, months and years at once, plus an exact years-months-days breakdown. Pick a start and end date above and it updates instantly.

By default it counts the gap between the dates (the end day not included). Tick “Include the end day” to count both endpoints — useful for things like hotel nights or billing periods where both days count.

Business days vs calendar days

Calendar days count every day; business days count only Monday to Friday. The calculator shows both, so you can plan a deadline that depends on working days. Note that it excludes weekends but not public holidays, which vary by state and employer — subtract any holidays in your range for an exact working-day count.

Weeks, months and years

The same gap is shown several ways: weeks are days ÷ 7, and the approximate months and years use the average month (30.44 days) and year (365.25 days). For an exact calendar split — say 1 year, 2 months and 5 days — use the years-months-days breakdown, which respects real month lengths.

Counting toward or from a date

If your end date is earlier than your start date, the calculator still works and notes that the range runs backwards — handy for counting how long ago something happened. To add or subtract a number of days from a date instead, that's a date calculator (a related tool); here the focus is the span between two known dates.