時間日期操作組件joda 簡單體驗

時間日期操作組件joda 簡單體驗:
構造方法&取出3個月之前的日期時間

    @Test
    public void testJoda1() {
        DateTime dateTime=new DateTime(2017, 5, 31, 18, 23,55);
        String s1 = "-";
        String s2 = "3";
        int minus = Integer.parseInt(s1 + s2);
        System.out.println(minus);
        dateTime = dateTime.plusMonths(minus);
        System.out.println(dateTime.toString("yyyyMMddHHmmss"));
    }

取出當前日期的年月日，返回int

    @Test
    public void testJoda2() {
        DateTime dateTime = new DateTime();
        System.out.println("year:" + dateTime.getYear());
        System.out.println("month:" + dateTime.getMonthOfYear());
        System.out.println("day:" + dateTime.getDayOfMonth());
    }

取出一天前的三個月前的日期時間，格式化輸出(just like SimpleDateFormat)

    @Test
    public void testJoda3() {
        System.out.println(new DateTime().plusDays(-1).toString("yyyyMMdd"));
    }