Apache Nifi表达语言-toDate格式 [英] Apache Nifi Expression Language - toDate formatting

问题描述

我正在尝试使用Apache Nifi表达式语言和替换文本"处理器(regex)格式化日期字符串.给定日期字符串

I am trying to format a date string using the Apache Nifi expression language and the Replace Text processor(regex). Given a date string

date_str : "2018-12-05T11:44:39.717+01:00", 

我希望将其转换为:

correct_mod_date_str: "2018-12-05 10:44:39.717", 

(请注意如何将日期转换为UTC，并用空格替换字符"T".)

(notice how the date is converted to UTC, and character 'T' replaced by a space.)

为此，我目前正在使用:

To do this, I am currently using:

toDate("yyyy-MM-dd'T'HH:mm:ss.SSSSSSXXX"):format("yyyy-MM-dd HH:mm:ss.SSS", '+00:00')

这很完美.

但是，当日期字符串中的 ms 以6位而不是3位表示时，事情就中断了:

However, when the date string has 6 digits in ms, rather than 3, things break:

another_date_str: "2018-12-05T11:44:39.717456+01:00"

转换为:

incorrect_mod_date_str: "2018-12-05 10:56:36.456"

ms 精度中的前3位数字似乎会干扰转换.

It seems the first 3 digits in the ms precision interferes with the conversion.

赞赏输入以解决此问题-我想念什么?

Appreciate inputs to resolve this - what am I missing?

致谢

推荐答案

似乎在Java中是一个限制.

seems that's a limitation in java.

根据Java文档，不支持超过3毫秒的数字.

according to java documentation there is no support of more then 3 milliseconds digits.

https://docs.oracle.com/javase/8/docs/api/java/text/SimpleDateFormat.html

最简单的方法是删除这样的多余数字:

the simplest way is to remove extra digits like this:

attr:replaceAll('(\.\d{3})\d*','$1'):toDate("yyyy-MM-dd'T'HH:mm:ss.SSSXXX"):format("yyyy-MM-dd HH:mm:ss.SSS", '+00:00')

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