public static int calculateWeekDay(int month, int year){

int weekdayOnFirstDayOfYear = calculateWeekdayOnFirstDayOfYear(year);

int dayOfYear = calculateDayOfYearOnFirstOfMonth(month, year);

//If Jan 1 falls on a sunday, weekdayOnFirstDayOfYear = 0 for sunday

//and since Jan 1 is first day of year, its dayofyear = 1

//When the method calculateWeekDay is queried for Jan 1, this method should return 0 (for sunday)

//So, we need to do -1 on dayOfYear's value (1 - 2 + 0) % 7 = 0 % 7 = 0

int weekDay = (dayOfYear - 1 + weekdayOnFirstDayOfYear)%7;

if(DEBUG) System.out.println("In calculateWeekDay: weekday: " + weekDay);

return weekDay;

}