Java 中的当前日期和时间

Current Date & Time in Java

提问by Beginner

I want the current date and time in the following format :

我想要以下格式的当前日期和时间：

Date :YYYYMMDD

日期 :YYYYMMDD

Time : HHMMSS

时间 : HHMMSS

I tried the following

我尝试了以下

DateFormat dateFormat = new SimpleDateFormat("yyyyMMdd");
   //get current date time with Date()
   Date date = new Date();
   System.out.println(dateFormat.format(date));

   //get current date time with Calendar()
   Calendar cal = Calendar.getInstance();
   System.out.println(new Date().getTime());

By this I am getting the desired date output but the time is coming in this way 1341837848290.

通过这种方式，我得到了所需的日期输出，但时间以这种方式 1341837848290。

The expected is HHMMSS.

预期是 HHMMSS。

回答by Jigar Joshi

Use format()

利用 format()

System.out.println(new SimpleDateFormat("HH:mm:SS").format(new Date()));

Date instance doesn't have any property to hold custom format, So you need to format the date instance to String with your custom format HH:mm:SS (See API docfor more detail)

日期实例没有任何属性来保存自定义格式，因此您需要使用自定义格式 HH:mm:SS 将日期实例格式化为字符串（有关更多详细信息，请参阅API 文档）

See

看

• IDEOne demo

• IDEOne演示

回答by Rajesh

try this 

DateFormat dateFormat = new SimpleDateFormat("yyyyMMdd");
   //get current date time with Date()
   Date date = new Date();
   System.out.println(dateFormat.format(date));

   //get current date time with Calendar()
DateFormat timeFormat = new SimpleDateFormat("HHmmss");
   Date d=new Date();
   System.out.println(timeFormat.format(d);

回答by Scorpio

Did you check out the joda-time library? Link here

您是否查看了 joda-time 库？链接在这里

With joda-time, you could easily call new DateTime(), call toString()on it and have this output, which may be more what you want:

使用 joda-time，您可以轻松调用new DateTime()、调用toString()它并获得此输出，这可能更符合您的要求：

public static void main(final String[] args) {
        final DateTime d = new DateTime();
        System.out.println(d.toString());
    }

Output: 2012-07-09T14:54:13.366+02:00

输出：2012-07-09T14:54:13.366+02:00

Joda-Time is very powerful on the plus side. Of course, this is an extra lib you need to include, and if this is not possible or desired, another approach would probably be better.

Joda-Time 在有利方面非常强大。当然，这是您需要包含的额外库，如果不可能或不希望这样做，另一种方法可能会更好。

回答by npinti

I tried this:

我试过这个：

SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd HHmmss");
Date date = Calendar.getInstance().getTime();
System.out.println(sdf.format(date));

Yields:

产量：

20120709 145518

20120709 145518

First section is the date (20120709), the second section is the time(145518).

第一部分是日期（20120709），第二部分是时间（145518）。

It seems that you have been using the wrong notation. I would recommend you take a look herefor full details.

看来您一直在使用错误的符号。我建议您查看此处以获取完整详细信息。

回答by swapy

DateFormat dateFormat = new SimpleDateFormat("yyyyMMdd HH:mm:SS");
    //get current date time with Date()
Date date = new Date();
System.out.println(dateFormat.format(date));

for more formatting refer API Doc

有关更多格式，请参阅 API Doc