如何在Java中以ISO日期格式打印当前时间和日期?

问题描述

我应该按照下面给出的ISO格式发送当前日期和时间:

I am supposed to send the current date and time in ISO format as given below:

'2018-02-09T13:30:00.000-05:00'

我写了以下代码:

Date date = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm");
SimpleDateFormat formatter1 = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.000'Z'");
System.out.println(formatter.format(date));
System.out.println(formatter1.format(date));

它以以下方式打印:

2018-04-30T12:02
2018-04-30T12:02:58.000Z

但是它不是按照上述格式打印的.如何获取格式所示的-5:00，它表示什么?

But it is not printing as the format mentioned above. How can I get the -5:00 as shown in the format and what does it indicate?

推荐答案

在Java 8中，您可以使用新的 java.time api:

In java 8 you can use the new java.time api:

OffsetDateTime now = OffsetDateTime.now();
DateTimeFormatter formatter = DateTimeFormatter.ISO_DATE_TIME;
System.out.println(formatter.format(now)); // e.g. 2018-04-30T08:43:41.4746758+02:00

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以上使用标准的ISO数据时间格式器.您还可以使用以下方法截断毫秒数:

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The above uses the standard ISO data time formatter. You can also truncate to milliseconds with:

OffsetDateTime now = OffsetDateTime.now().truncatedTo(ChronoUnit.MILLIS);

会产生类似的结果(点后仅3位数字):

Which yields something like (only 3 digits after the dot):

2018-04-30T08:54:54.238+02:00

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