在 Ruby 中将 UTC 时间戳转换为 ISO 8601
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Converting UTC timestamp to ISO 8601 in Ruby
提问by ming yeow
I have a timestamp that is in UTC
我有一个 UTC 时间戳
"2010-10-25 23:48:46 UTC"
“2010-10-25 23:48:46 UTC”
I need to convert it into ISO 8601
我需要将其转换为 ISO 8601
"2010-10-29 06:09Z"
“2010-10-29 06:09Z”
The documentation is confusing as hell - what is the easiest way to do that?
文档令人困惑 - 最简单的方法是什么？
回答by Ryan Bigg
I think you're trying to trick us.
我想你是想欺骗我们。
The input date to your question is the 25th of October, 2010, whilst the output is the 29thof October, 2010. Well played!
您问题的输入日期是2010 年 10 月 25 日，而输出日期是2010 年 10 月29日。打的好！
Continuing on this nit-picking thread: your times are also completely different and you're missing the seconds from the output time.
继续这个挑剔的线程：你的时间也完全不同，你错过了输出时间的秒数。
Now for the true answer.
现在来看看真正的答案。
A little factoid first though: the ISO 8601 output in Ruby is similar to the "Combined date and time" output from ISO 8601's Wikipedia page.
不过首先要说明一点：Ruby 中的 ISO 8601 输出类似于ISO 8601 维基百科页面中的“组合日期和时间”输出。
You've got a string and so you'll need to convert it into a Timeobject which you can do with to_time. Then it's simply a matter of calling iso8601on that object to get the ISO 8601 version:
你有一个字符串，所以你需要将它转换成一个Time对象，你可以用to_time. 然后只需调用iso8601该对象即可获取 ISO 8601 版本：
"2010-10-25 23:48:46 UTC".to_time.iso8601
The to_timemethod is courtesy of Rails, whilst the iso8601is courtesy of Ruby's standard library.
该to_time方法由 Rails 提供，而iso8601Ruby 标准库提供。
回答by Steeve McCauley
After much experimenting, I find the Time library's parser to be better than DateTime, although the reasons escape me at the moment. With that caveat, I always use Time rather than DateTime for this kind of stuff, and the ruby documentation is also difficult to grok as to why this is so,
经过多次试验，我发现 Time 库的解析器比 DateTime 更好，尽管目前我不知道原因。有了这个警告，我总是使用 Time 而不是 DateTime 来处理这种事情，而且 ruby 文档也很难理解为什么会这样，
require 'time'
puts Time.parse("2010-10-25 23:48:46 UTC").iso8601
"2010-10-25T23:48:46Z"
回答by Aerodame
Note: you have to convert (parse) a time string into a time object before you can apply the to_time method.
注意：您必须先将时间字符串转换（解析）为时间对象，然后才能应用 to_time 方法。
ruby-1.9.2-p180 :016 > "2010-10-25 23:48:46 UTC".to_time.iso8601
NoMethodError: undefined method `to_time' for "2010-10-25 23:48:46 UTC":String
from (irb):16
Correct procedure:
正确的程序：
irb> ut = DateTime.parse("2010-10-25 23:48:46 UTC")
irb> ut.iso8601
=> "2010-10-25T23:48:46+00:00"
回答by Allison
Adding an answer to this super old question because if you're using Rails, there is no need to convert/parse it in the way the other answers here are telling you to do:
为这个超级老问题添加一个答案，因为如果您使用 Rails，则无需按照此处的其他答案告诉您的方式来转换/解析它：
- If it's already a timestamp (e.g., a
created_atorupdated_atattribute), you can directlycall theiso8601method on that timestamp (e.g.,object.created_at.iso8601). - The
iso8601method also accepts a numeric argument to display fractional digits; you would use this if you want2020-04-06T19:16:55.604Zinstead of2020-04-06T19:16:55Z.
- 如果它已经是一个时间戳（例如，a
created_at或updated_at属性），您可以直接调用该iso8601时间戳上的方法（例如，object.created_at.iso8601）。 - 该
iso8601方法还接受一个数字参数来显示小数位数；如果您愿意2020-04-06T19:16:55.604Z，您可以使用它而不是2020-04-06T19:16:55Z.
https://api.rubyonrails.org/v5.2.4/classes/ActiveSupport/TimeWithZone.html#method-i-iso8601
https://api.rubyonrails.org/v5.2.4/classes/ActiveSupport/TimeWithZone.html#method-i-iso8601
