Calculator
Pick two dates and get the exact gap between them — in days, weeks, months, and years — instantly, with no upload or signup.
The calculator counts whole calendar days between your two dates, then breaks that total down into a more readable years/months/days form, plus the equivalent in complete weeks. It doesn't matter which date is earlier — enter them either way and the result will show a negative sign if the end date comes before the start date.
Need to go the other direction — start from one date and find what date lands a certain number of days later? Try the Add/Subtract Days tool instead.
Related
Find the date that's N days before or after a starting point.
Same idea, but counting only working days.
A specialized version of this tool, anchored to a birth date.