Loading Legacy
Date Difference Calculator calculates the exact number of days, weeks, months, and years between two dates, counts business days (excluding US federal holidays), and adds or subtracts time from any date.
Date Difference Calculator is a high-performance utility designed to help users streamline their workflow. Built with modern web technologies, it ensures fast processing times and high-quality outputs directly in your browser.
Day difference = ceil((end − start) / 86,400,000 ms). Business days count Mon–Fri dates, skipping 11 hardcoded US federal holidays for 2026. Month/year approximations use 30.44 days/month and 365.25 days/year.
Yes, it excludes 11 US federal holidays for 2026.
Yes, use the Add/Subtract tab to add days, weeks, months, or years to any date.