SimpleDateFormat时间显示24小时和12小时时间格式

    public static void main(String[] args) {
        Date date = new Date();
        System.out.println("date = " + date);//date = Sat Aug 29 17:06:01 CST 2020
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        SimpleDateFormat simpleDateFormat1 = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
        String format = simpleDateFormat.format(date);
        System.out.println("format = " + format);//format = 2020-08-29 17:06:01
        String format1 = simpleDateFormat1.format(date);
        System.out.println("format1 = " + format1);//format1 = 2020-08-29 05:06:01
    }