Java8 DateTimeFormatter上午/下午 [英] Java8 DateTimeFormatter am/pm

问题描述

我正在尝试解析一些日期，但DateTimeParser似乎不同意我的有效内容

I am trying to parse some dates, but the DateTimeParser seems to disagree with me on what is valid

import java.time.ZonedDateTime
import java.time.format.DateTimeFormatter
import java.util.Locale

ZonedDateTime.parse("Wed Jul 16, 2016 4:38pm EDT", DateTimeFormatter.ofPattern("EEE MMM dd, yyyy hh:mma z", Locale.US))

我试试这个它说

java.time.format.DateTimeParseException: Text 'Wed Jul 16, 2016 4:38pm EDT' could not be parsed at index 17

因此小时出现问题？当我放下其中一个'h'时它会变得更远（尽管它应该只用0-pad我的小时），但是它不喜欢pm-stuff

So something is wrong with the hours? When I drop one of the 'h' it gets further ( altough it should just 0-pad my hours ), but then it doesn't like the pm-stuff

ZonedDateTime.parse("Wed Jul 16, 2016 4:38pm EDT", DateTimeFormatter.ofPattern("EEE MMM dd, yyyy h:mma z", Locale.US))
java.time.format.DateTimeParseException: Text 'Wed Jul 16, 2016 4:38pm EDT' could not be parsed at index 21

我不知道他的确切问题是什么。当我尝试'hh：mmaa'作为模式时，它表示它不喜欢两个a而现在我被卡住了，因为错误消息没有帮助。

I don't know what his exact problem is. When I try 'hh:mmaa' as a pattern it says that it doesn't like two a and now i am stuck, since the error messages are not helpful.

推荐答案

a 要求 PM 或 AM 大写。要获得不区分大小写的格式化程序，您需要手动构建它：

a expects either PM or AM in upper case. To get a case insensitive formatter you need to build it manually:

DateTimeFormatter fmt = new DateTimeFormatterBuilder()
        .parseCaseInsensitive()
        .appendPattern("EEE MMM dd, yyyy h:mma z")
        .toFormatter(Locale.US);

请注意，由于7月16日不是星期三，您将收到新错误。

Note that you will get a new error because the 16th of July is not a Wednesday.

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