Gets the day-of-year corresponding to the first day of this month.
!(p)
This returns the day-of-year that this month begins on, using the leap
year flag to determine the length of February.
@param leapYear true if the length is required for a leap year
@return the day of year corresponding to the first day of this month, from 1 to 336
Gets the day-of-year corresponding to the first day of this month. !(p) This returns the day-of-year that this month begins on, using the leap year flag to determine the length of February.
@param leapYear true if the length is required for a leap year @return the day of year corresponding to the first day of this month, from 1 to 336