[JSP] JSP D-day 계산

<%@ page import = "java.text.*" %>
<%@ page import = "java.util.*" %>
<%
  // 2010 남아공 월드컵
  int DdayYear = 2010;
  int DdayMonth = 6;
  int DdayDate = 11;
 
  Calendar currentCalendar = Calendar.getInstance();
  Calendar cal = Calendar.getInstance();

  int curYear =currentCalendar.get(Calendar.YEAR);
  int curMonth =currentCalendar.get(Calendar.MONTH)+1;
  int curDate =currentCalendar.get(Calendar.DATE);

  int nTotalDate1 = 0, nTotalDate2 = 0, nDiffOfYear = 0, nDiffOfDay = 0;

  //System.out.println("오늘은 올해의 " +cal.get(Calendar.DAY_OF_YEAR)+"번째 날 입니다");
  //System.out.println("오늘은 이번주의 " +cal.get(Calendar.DAY_OF_WEEK)+"번째 날 입니다");
  //System.out.println("오늘은 올해의 "+cal.get(Calendar.WEEK_OF_YEAR)+"번째 주 입니다");

  if(DdayYear > curYear){  
    for(int i=curYear; i<DdayYear; i++){
      cal.set(i, 12, 0); // 2010, 12, 0
      nDiffOfYear += cal.get(Calendar.DAY_OF_YEAR);
    }
    nTotalDate1 += nDiffOfYear;
  }else if(DdayYear < curYear){
    for(int i=DdayYear; i<curYear; i++){
      cal.set(i, 12, 0);
      nDiffOfYear += cal.get(Calendar.DAY_OF_YEAR);
    }
    nTotalDate2 += nDiffOfYear; 
  }

  cal.set(DdayYear, DdayMonth-1, DdayDate);
  nDiffOfDay = cal.get(Calendar.DAY_OF_YEAR);
  nTotalDate1 += nDiffOfDay;

  cal.set(curYear, curMonth-1, curDate);
  nDiffOfDay = cal.get(Calendar.DAY_OF_YEAR);
  nTotalDate2 += nDiffOfDay;
 
  int Dday = nTotalDate1 - nTotalDate2;
%>