Calculate the number of days, weeks and months between any two dates.
Days, weeks and months between two dates
This free calculator gives you instant, accurate results with no signup required. Use it to make smarter, more informed financial and life decisions.
Always double-check important financial decisions with a qualified professional. This calculator provides estimates for guidance purposes. Results may vary based on your specific circumstances.
Manually counting days between two dates seems simple until you hit month-length differences, leap years, and the classic "do you count the start day, the end day, or both" ambiguity that trips up everything from contract deadlines to project planning.
Business or working day calculations add another layer of complexity — weekends and public holidays mean the gap between two dates in working days is often meaningfully shorter than the raw calendar day count, which matters significantly for project deadlines and legal notice periods.
Leap years occur every 4 years (with some exceptions for century years not divisible by 400), adding an extra day to February — easy to forget when manually calculating date ranges that span late February, leading to off-by-one errors in date math.
Use the calculator above for instant, accurate date range calculations in days, weeks, and approximate months — far more reliable than manual counting, especially for date ranges spanning multiple months or years with varying month lengths.