Date Calculator
Calculate exactly how many days, weeks, months, and years are between any two dates. Includes working days.
Days Between Dates
0 days
📐 Formula
Days Between = |Date2 − Date1| ÷ 86,400,000 milliseconds. Working days ≈ Total days × (5/7)
Frequently Asked Questions
Subtract the earlier date from the later date in milliseconds, then divide by 86,400,000 (milliseconds per day). This calculator handles all the complexity for you.
A standard year has 260–262 working days (52 weeks × 5 days), minus public holidays. In the US, with 10 federal holidays, the typical number is about 250 working days per year.
Calendar days count every day including weekends and holidays. Working days (business days) only count Monday–Friday, excluding public holidays. Always clarify which type is meant in contracts or deadlines.