import java.util.Date;

class testing

{

public int getDaysRange(Date date1, Date date2){

long mills_per_day = 1000 * 60 * 60 * 24; 

long day_diff = ( date1.getTime() - date2.getTime() ) / mills_per_day; 

return (int)day_diff;

}

public String sayDay(int range){

String day="";

int tebakan = (range % 7) + 1;

switch(tebakan){

case 0 : day = "Sabtu"; break;

case 1 : day = "Sabtu"; break;

case 2 : day = "Minggu"; break;

case 3 : day = "Senin"; break;

case 4 : day = "Selasa"; break;

case 5 : day = "Rabu"; break;

case 6 : day = "Kamis"; break;

case 7 : day = "Jumat"; break;

}

return day;

}

public static void main(String[] args){

Date date1 = new Date("01/01/2011");

Date date2 = new Date("01/31/2011");

testing tebak = new testing();

System.out.println("Hari " + tebak.sayDay(tebak.getDaysRange(date2, date1)));

}

}