Date Difference Calculator
Days, weeks & months between dates.
Runs entirely in your browser — nothing you enter is uploaded, logged, or tracked.
Pick a start and end date to see the exact gap between them — in days, weeks, months and years — plus the number of business days (Monday–Friday). Useful for deadlines, notice periods, leases and project planning.
Frequently asked questions
Does it count both the start and end dates?
By default it counts the days between the two dates (end minus start). The result also notes the count when both endpoints are included.
What counts as a business day?
Monday through Friday. Public holidays vary by country and are not subtracted, so adjust for any holidays in your region.
Can it handle dates far apart or across leap years?
Yes — it uses real calendar dates, so leap years and month lengths are handled automatically.