This function is used to returns the month as an integer from 1 (January) to 12 (December).
See this note.
int Month(double d)
If it is a Julian days date, return the year, 1 to 12.
If it is not a Julian days date, return missing value.
rr= ; // Should return the month, 12.
WeekDay, WeekNum, Year, Day, Hour, Minute, Second, Now,