java & javascript 요일 구하기

java

public String getWeekDay(String day) {

Calendar cal = Calendar.getInstance();

cal.set(Calendar.YEAR, Integer.parseInt(day.substring(0,4)));

cal.set(Calendar.MONTH, Integer.parseInt(day.substring(4,6)) -1);

cal.set(Calendar.DATE, Integer.parseInt(day.substring(6,8)));

String[] dayOfWeek = {"일","월","화","수","목","금","토"};

String weekday = dayOfWeek[cal.get(Calendar.DAY_OF_WEEK)-1];

return weekday ;

}

 

 

javascript

    // 요일구하기 함수
    function ext_day(n_year,n_month,n_day){
      var p_year = n_year -1;
      var p_month = n_month-1;
      var ext = 0;
      ext = parseInt((p_year*365 + parseInt(p_year/4) + day_cnt(n_year,p_month) + e_day -1)%7)
      return day_str(ext)
    }
    //날짜 수 계산(요일 구하기 함수의 부분....)
    function day_cnt(year, month) {
      if(month==1) return 31
      else if(month==2){
        if(year%4==0) return 60
        else return 59
      }
      else if(month==3){
        if(year%4==0) return 91
        else return 90
      }
      else if(month==4){
        if(year%4==0) return 121
        else return 120
      }
      else if(month==5){
        if(year%4==0) return 152
        else return 151
      }
      else if(month==6){
        if(year%4==0) return 182
        else return 181
      }
      else if(month==7){
       if(year%4==0) return 213
       else
        return 212
       }
      else if(month==8){
        if(year%4==0) return 244
        else return 243
      }
      else if(month==9){
        if(year%4==0) return 274
        else return 273
      }
      else if(month==10){
        if(year%4==0) return 305
        else return 304
      }
      else if(month==11){
        if(year%4==0) return 335
        else return 334
      }
      else if(month==12){
        if(year%4==0) return 366
        else return 365
      }
    }
    // 요일 표시(요일 구하기 함수의 부분....)
    function day_str(num) {
      if(num==0) return "일"
      else if(num==1) return "월"
      else if(num==2) return "화"
      else if(num==3) return "수"
      else if(num==4) return "목"
      else if(num==5) return "금"
      else return "토"

-------------------------------------------

사용예

ext_day(2013, 3, 11);