Date Difference

Days, weeks, months and working days between two dates, with optional inclusive counting.

What this tool does

Enter two dates to get the total days between them, the equivalent in weeks, approximate months and years, and a working-day count (Monday to Friday, public holidays not included). Tick the inclusive option to count both the start and end dates — that one-day difference in convention is a classic source of contract and scheduling disputes.

Typical use cases

Checking how many working days remain before a launch; verifying whether a contract term, probation period, or warranty has expired; counting down to an exam, wedding, or holiday; calculating tenure for leave entitlement; checking promised delivery times. Any situation where two dates need to become a duration.

Caveats

The working-day figure only removes Saturdays and Sundays — public holidays and adjusted workdays vary by country and year, so check the official calendar for anything formal. Mind the counting convention: from January 1 to January 2 is 1 day exclusive, 2 days inclusive; spell it out when a contract says “within three days”. Dates are parsed as Gregorian calendar dates in your browser's time zone.