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Calculate exact days, business days, and time between any two dates.
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.
Find the exact difference between two dates in days, weeks, months, and years. Count business days, add or subtract time, and track important date ranges.
Enter start and end dates.
See the difference in days, weeks, months, and years.
Switch to Business Days or Add/Subtract for more options.
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.