用Java解析日期的毫秒部分 [英] Parsing milliseconds fraction of date in Java

问题描述

我正在使用以下模式在Java中解析日期(从服务器获取):"yyyy-MM-dd'T'HH:mm:ss.SSS" .

I am parsing dates (got from server) in Java using this pattern: "yyyy-MM-dd'T'HH:mm:ss.SSS".

传入字符串可能是以下类型:

Incoming strings may be of these types:

2015-01-01T00:00:00.561
2015-01-01T00:00:00.5

我的问题是毫秒数.我在弄清楚第二个字符串中的 .5 是 5 还是 500 ms时遇到麻烦.因为当我使用模式解析它时，会得到 500 ms.似乎还可以，但是需要仔细检查服务器端是否有任何共同的契约来修整那些零.我不问服务器是否返回 2015-01-01T00:00:00.500 ，但是对于 .5 ，我不确定服务器端 5 或 500 毫秒.

My question is about milliseconds fraction. I am having trouble figuring out whether the .5 in the second string is 5 or 500 ms. Because when I parse it using my pattern I get 500 ms. Seems OK, but need to double check if there is any common contract to trim those zeros on server side. I would not ask if server returned 2015-01-01T00:00:00.500, but with .5 I am not sure what is on server side 5 or 500 ms.

更新:

我刚刚与服务器团队进行了交谈，他们确认 .5 是 .500 .

I just had a talk with the server team, they confirmed .5 is .500.

推荐答案

ISO 8601

该模式 YYYY-MM-DDTHH:MM:SS.SSS±HH:MM 是您的特定用法忽略了 UTC 的偏移量(末尾的加号/减号).如果不使用偏移量，则该值是本地时间"，表示任何本地位置，例如圣诞节始于2015-12-25T00:00:00".

Your particular usage omits the offset from UTC (the plus/minus at the end). Without the offset, the value is a "local time" meaning it refers to any locality such as "Christmas starts at 2015-12-25T00:00:00".

Joda-Time 库和

Both the Joda-Time library and java.time package use ISO 8601 formats as their defaults in generating/parsing strings.

是的，点后的数字确实只是十进制小数.点是小数点.诸如 0.5 的值与 0.500 相同，均表示半秒的时间，即500毫秒.

Yes, the digits after the dot are indeed simply a decimal fraction. The dot is a decimal point. A value such as 0.5 is the same as 0.500, both mean one half of a second, 500 milliseconds.

因此， 2015-01-01T12:34:56.7 与 2015-01-01T12:34:56.700 相同.

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