Date Difference Calculator

Whether you're calculating a project timeline, counting down to an event, or figuring out how long ago something happened, this calculator gives you a calendar-accurate breakdown between any two dates — in years, months, and days — plus useful totals like total days, weeks, and business days.

Optional settings let you include the exact time of day for precise hour-and-minute differences, count the end date as a full day, or show business-day counts that exclude weekends.

Common uses

Calculating contract or lease durations, figuring out someone's exact tenure at a job, counting down to a deadline, or estimating working days available for a project.