Get Day of Month Method
The Get Day of Month method returns the day of the month of a date object. For more information, see Values for Dates and Times.
Format
dateVar.getDate()
The following example returns a value of 7, the day part of the date object:
function Button2_Click ()
{
var MyBirthdayDay = new Date("1958", "11", "7");
TheApplication().RaiseErrorText("My birthday is on day " +
MyBirthdayDay.getDate() + ".");
}