package com.crhms.util;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Test {
	public static void main(String[] args) {
		try {
			String time = "2013-04-21";
			DateFormat fm = new SimpleDateFormat("yyyy-MM-dd");
			Date date = fm.parse(time);
			//Date date2 = new Date(System.currentTimeMillis());
			String str = String.format("%tj",date);//得到time日期是在這年的第幾天
			System.out.println(str);
		} catch (ParseException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	}
}
 

>>Output: