Question 1

How do I add or subtract days from a date?

Accepted Answer

Enter a start date and a day offset. The calculator returns the resulting calendar date, accounting for month lengths and leap years.

Question 2

How can I count days between two dates?

Accepted Answer

Choose the difference mode, select start and end dates, and the tool returns total days. Optionally include or exclude the end date.

Question 3

What about business days only?

Accepted Answer

Enable business days to exclude weekends. You can add custom holidays to exclude them as well.

Question 4

Does the tool handle leap years?

Accepted Answer

Yes. February has 29 days in leap years; rules follow the Gregorian calendar.

Question 5

What about time zones and DST?

Accepted Answer

Date math uses calendar days; if you include times, the tool converts based on your selected time zone to avoid DST shifts.

Date Calculator — Date Difference & Duration Calculator