Days Between Dates

This calculator finds the exact number of days between any two dates, then converts that into weeks, months, and years for convenience.

It converts both dates to timestamps, takes the absolute difference in milliseconds, and divides by the number of milliseconds in a day. Weeks divide that by 7, while months and years use average calendar lengths (30.44 and 365.25 days) to smooth out varying month and leap-year lengths.

Example: From January 1, 2024 to June 29, 2026 is 910 days — about 130 weeks, 30 months, or roughly 2.5 years.