JavaSE Date

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class DateTest {
    public static void main(String[] args) {
        Date d = new Date(94,5,1,4,0);
        long l = d.getTime();
        Date d2 = new Date();
        long ll = d2.getTime();
        System.out.println((ll-l)/1000/60/60/24);

        // 日期格式化
        String s1 = "yyyy-MM-dd HH:mm:ss";
        String s2 = "yyyy年MM月dd日 HH时mm分ss秒";
        String s3 = "yyyy/MM/dd HH:mm:ss";
        String s4 = "yyyy-MM-dd";
        String s5 = "yyyy.MM.dd HH:mm:ss";
        Date date = new Date();// 当前时间

        SimpleDateFormat sdf = new SimpleDateFormat(s5);
        // Date -> String
        String s = sdf.format(date);
        System.out.println(s);
        // String -> Date
        String dd = "2017.10.01 12:53:05";
        Date date1;
        try {
            date1 = sdf.parse(dd);
            System.out.println(date1);
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    
    }

}