Date Difference Calculator
Calculate the exact difference between two dates — with working days option
How Date Difference Is Calculated
The total number of days is calculated by subtracting the start date from the end date. Working days are counted by iterating through each day and skipping Saturdays and Sundays. The "include end date" option adds 1 to the total (useful when counting both the first and last day of a period).
Years, months and days are calculated the same way as age — the years component counts complete years, then remaining months and days. This gives an exact human-readable breakdown rather than a simple division.
// Working Days
The "working days" count excludes Saturdays and Sundays but does not account for public holidays, which vary by country.
// Include End Date
If you want to count both the first and last day (e.g. "from Monday to Friday inclusive = 5 days"), tick "include end date".
// Project Planning
For project timelines, use working days. A "2-week project" typically means 10 working days, not 14 calendar days.
// Deadline Counting
Legal deadlines often use calendar days. Contract deadlines may specify "business days". Always check which counting method applies.