Last updated: March 2026
About Date Duration Calculator
Calculate the exact duration between any two dates. See total days, business days, weekends, weeks, months, and years. US federal holiday awareness shows which holidays fall in your date range.
Frequently Asked Questions
Does it count business days?
Yes. The calculator shows both total calendar days and business days (Monday-Friday), plus weekend count and US federal holidays in the range.
Can I add days to a date?
Yes. Use the date math section to add or subtract days, weeks, months, or years from any starting date.