Java获取当前时间年月日的方法

Java获取当前时间年月日的方法

public static void main(String[] args) throws ParseException {
    Calendar now = Calendar.getInstance();
    System.out.println("年: " + now.get(Calendar.YEAR));
    System.out.println("月: " + (now.get(Calendar.MONTH) + 1) + "");
    System.out.println("日: " + now.get(Calendar.DAY_OF_MONTH));
    System.out.println("时: " + now.get(Calendar.HOUR_OF_DAY));
    System.out.println("分: " + now.get(Calendar.MINUTE));
    System.out.println("秒: " + now.get(Calendar.SECOND));
    System.out.println("当前时间毫秒数：" + now.getTimeInMillis());
    System.out.println(now.getTime());

    Date d = new Date();
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    String dateNowStr = sdf.format(d);
    System.out.println("格式化后的日期：" + dateNowStr);

    String str = "2022-09-13 17:26:33"; //要跟上面sdf定义的格式一样
    Date today = sdf.parse(str);
    String dateNowStr1 = sdf.format(today);
    System.out.println("格式化后的日期：" + dateNowStr1);


    String str1 = "2012-1-13 17:26:33"; //要跟上面sdf定义的格式一样
    Date today1 = sdf.parse(str1);
    System.out.println("字符串转成日期：" + today1);
}

年: 2022
月: 10
日: 14
时: 17
分: 3
秒: 1
当前时间毫秒数：1665738181754
Fri Oct 14 17:03:01 CST 2022
格式化后的日期：2022-10-14 17:03:01
格式化后的日期：2022-09-13 17:26:33
字符串转成日期：Fri Jan 13 17:26:33 CST 2012

Process finished with exit code 0