Select two dates on the left
or pick a quick preset
Date Difference Calculator
Calculate the exact number of days, weeks, months and years between any two dates. Useful for age calculations, project timelines, countdowns, and contract durations.
How the Breakdown Works
The Years / Months / Days breakdown counts complete calendar units — e.g. "1 year, 3 months, 12 days" — rather than converting everything to a single unit. This matches how people naturally talk about age and duration.
Business Days
The business days count excludes Saturdays and Sundays. It does not account for public holidays (which vary by country). Enable the toggle in the options to see the business day count alongside the calendar day count.
Is any data sent to a server?
No — all calculations run in your browser using the native Date API. Nothing is transmitted.