import java.util.Date;

import java.text.SimpleDateFormat;

public class DatePractice {

public static void main(String[] args) {

// java.util.Date() : old-fashioned class (deprecated)

Date date = new Date();

System.out.println(date); // original

System.out.println(date.toLocaleString()); // print in Korean

System.out.println(date.getYear() + 1900); // the year represented by this date, minus 1900

System.out.println(date.getDay()); // int, 0 = Sunday

// set a date

Date date2 = new Date(2015-1900, 3-1, 7); // month : 0 = January

System.out.println("\n" + date2);

System.out.println(date2.getYear() + date2.getMonth() + date2.getDate()); // int + int + int

// System.out.println(date2.getYear().toString() + date2.getMonth().toString() + date2.getDate().toString()); // error

System.out.println(date2.getYear() + " " + date2.getMonth() + " " + date2.getDate());

System.out.println((date2.getYear() + 1900) + "-" + (date2.getMonth() + 1) + "-" + date2.getDate());

// set a date format

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd");

System.out.println("\n" + sdf.format(date2));

SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd");

System.out.println(sdf2.format(date2)); // crazy

// minus(-) operation between two times different to each other

long dateDiff = date.getTime() - date2.getTime();

System.out.println("\nIt has been " + dateDiff/1000/60/60/24 + " days since we got married.");

// 1 from getTime() means 1/1,000 second

}

}