년도, 월, 일 을 가지고 요일을 계산한다.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | /** Zeller's congruence @param day the day of the month @param month the month @oaran year the year return the weekday (0 = Monday, 1 = Tuesday, ..., 6 = Sunday)*/int zeller(int day, int month, int year){ int modifiedMonth[] = { 0, // not used 13, 14, 3, 4, // month : 1 ~ 4 5, 6, 7, 8, // month : 5 ~ 8 9, 10, 11, 12 }; // month : 9 ~ 12 int w; int mm = modifiedMonth[month]; w = ( day + 5 + ( 26 * (mm + 1) ) / 10 + ( 5 * (year % 100) ) / 4 + ( 21 * (year / 100) ) / 4 ) % 7; return w;} |
