You enter a start and end date. The tool converts both to midnight timestamps, subtracts, takes the absolute value, and divides by 86,400,000 milliseconds to get whole days. Business days are counted by walking through each day and checking whether it falls on a weekday. Months and years use fixed averages (30.44 and 365.25) rather than calendar-aware arithmetic, so they are approximations.
No. The business-day count excludes Saturdays and Sundays only. National and local holidays are not removed because they vary by country and region. Subtract any holidays that fall on weekdays manually.
Calendar months range from 28 to 31 days, and years from 365 to 366. This tool divides by fixed averages (30.44 and 365.25) for a quick estimate. For an exact calendar-aware breakdown, use the date calculator.
It measures the gap between the two dates. Same-day inputs return 0. If you need to include both endpoints (for example, counting "Day 1" through "Day 5" as five days), add 1 to the result.
Yes. The calculator uses the absolute difference, so it does not matter which date is earlier. The result is always a positive number.
Estimate only. Results reflect your inputs and standard formulas. Double-check important decisions independently.