Question 1

Does the date calculator include both the start and end dates in the day count?

Accepted Answer

By default, the calculator measures elapsed duration between timestamps (e.g. from Monday to Tuesday is 1 day). If you need an inclusive count (counting both start and end dates as active days), add 1 to the result.

Question 2

How do you convert the day count into working business days?

Accepted Answer

Business days exclude Saturdays and Sundays. In a standard 7-day week, approximately 5 out of 7 days (about 71.4%) are business days, minus any statutory public holidays.

Question 3

How does the calculator handle daylight saving time (DST) shifts?

Accepted Answer

The calculator normalizes calendar dates using UTC midnight boundaries, preventing 23-hour or 25-hour DST transitions from distorting the whole-day integer count.

Question 4

How many days are in a leap year versus a common year?

Accepted Answer

A common calendar year has 365 days (52 weeks + 1 day). A leap year contains 366 days (52 weeks + 2 days) due to the addition of February 29.

Question 5

Can I calculate the date duration between historical centuries?

Accepted Answer

Yes. The underlying Gregorian date engine supports calculations across historical years and centuries within standard JavaScript Date limits (from 100 AD to 275,760 AD).