A date difference is the count of whole calendar days from one date to another, before that span is grouped into weeks, months or years. Count the exact number of days between two dates — plus total weeks, the years-months-days breakdown, total months and business days (Mon–Fri). Leap years and uneven month lengths are handled, and everything runs in your browser.
Two dates, an exact answer.
Pick the earlier date with the date selector — a project kickoff, an order date or any past or future day.
Pick the later date. The order does not matter — if you swap them, the tool keeps the result positive and tells you it swapped.
See the total days, weeks, the years-months-days breakdown, total months and business days. Tick Include end date to count the final day too. Working out someone's age instead? Use the Age Calculator.