blocks|key|325333|text|Easiest+is+to+use+strftime+(docs)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|325334|如果它是在视图端使用的，最好将它包装在一个helper中。|325335|entityMap|0|LINK|mutability|MUTABLE|url|http://apidock.com/ruby/v1_9_3_125/Time/strftime^0|I|8|0|X|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@$9|S|A|T|1|U]]|E|$]]|$1|F|3|G|5|6|7|V|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]]]

<a href="http://apidock.com/ruby/v1_9_3_125/Time/strftime">Easiest is to use <code>strftime</code> (docs)</a>.

If it's for use on the view side, better to wrap it in a helper, though.

blocks|key|542385|text|首先，您需要将时间戳转换为实际的Ruby日期/时间。如果你只是以字符串或int的形式从facebook接收它，你将需要这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|542386|my_date+=+Time.at(timestamp_from_facebook.to_i)|code-block|syntax|javascript|542387|然后，为了在视图中很好地格式化它，您可以只使用to_s+(用于默认格式)：|offset|length|style|CODE|542388|<%25=+my_date.to_s+%25>|542389|注意，如果你不放置to_s，如果你在视图或字符串中使用它，默认情况下仍然会调用它，例如下面的代码也会在date上调用to_s：|542390|<%25=+"Here+is+a+date:+#{my_date}"+%25>|542391|或者如果你想以特定的方式格式化日期(例如使用"d/m/Y")+-你可以使用另一个答案中概述的strftime。|542392|entityMap^0|0|0|N|4|0|0|9|4|1M|4|0|0|1A|8|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@$I|Z|J|10|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|12|8|@$I|13|J|14|K|L]|$I|15|J|16|K|L]]|9|@]|A|$]]|$1|Q|3|R|5|D|7|17|8|@]|9|@]|A|$E|F]]|$1|S|3|T|5|6|7|18|8|@$I|19|J|1A|K|L]]|9|@]|A|$]]|$1|U|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|V|$]]

First you will need to convert the timestamp to an actual Ruby Date/Time.
If you receive it just as a string or int from facebook, you will need to do something like this:

<pre><code>my_date = Time.at(timestamp_from_facebook.to_i)
</code></pre>

Then to format it nicely in the view, you can just use <code>to_s</code> (for the default formatting):

<pre><code>&lt;%= my_date.to_s %&gt;
</code></pre>

Note that if you don't put <code>to_s</code>, it will still be called by default if you use it in a view or in a string e.g. the following will also call <code>to_s</code> on the date:

<pre><code>&lt;%= "Here is a date: #{my_date}" %&gt;
</code></pre>

or if you want the date formatted in a specific way (eg using "d/m/Y") - you can use <code>strftime</code> as outlined in the other answer.

blocks|key|542458|text|由于时间戳是从UNIX纪元开始的秒数，因此可以使用带有正确说明符的DateTime.strptime+("string+parse+time")：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|542459|Date.strptime('1100897479',+'%25s')
#=>+#<Date:+2004-11-19+((2453329j,0s,0n),%2B0s,2299161j)>
Date.strptime('1100897479',+'%25s').to_s
#=>+"2004-11-19"
DateTime.strptime('1100897479',+'%25s')
#=>+#<DateTime:+2004-11-19T20:51:19%2B00:00+((2453329j,75079s,0n),%2B0s,2299161j)>
DateTime.strptime('1100897479',+'%25s').to_s
#=>+"2004-11-19T20:51:19%2B00:00"|code-block|syntax|javascript|542460|请注意，您必须使用require+'date'才能正常工作，然后您可以将其称为Date.strptime+(如果您只关心日期)或DateTime.strptime+(如果您想要日期和时间)。如果您需要不同的格式，可以对其调用DateTime#strftime+(如果您在处理格式字符串时遇到困难，请查看strftime.net+)或使用rfc822等内置方法之一。|style|CODE|542461|entityMap|0|LINK|mutability|MUTABLE|url|http://www.ruby-doc.org/stdlib-1.9.3/libdoc/date/rdoc/DateTime.html#method-c-strptime|1|http://www.ruby-doc.org/stdlib-1.9.3/libdoc/date/rdoc/DateTime.html#method-i-strftime|2|http://strftime.net/^0|X|H|0|0|0|9|E|13|D|1S|H|4O|6|34|H|1|47|C|2|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]]|C|$]]|$1|D|3|E|5|F|7|12|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|13|8|@$A|14|B|15|K|L]|$A|16|B|17|K|L]|$A|18|B|19|K|L]|$A|1A|B|1B|K|L]]|9|@$A|1C|B|1D|1|1E]|$A|1F|B|1G|1|1H]]|C|$]]|$1|M|3|-4|5|6|7|1I|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]|U|$5|P|Q|R|C|$S|V]]|W|$5|P|Q|R|C|$S|X]]]]

Since the timestamps are seconds since the UNIX epoch, you can use <a href="http://www.ruby-doc.org/stdlib-1.9.3/libdoc/date/rdoc/DateTime.html#method-c-strptime" rel="nofollow">DateTime.strptime</a> ("string parse time") with the correct specifier:

<pre><code>Date.strptime('1100897479', '%s')
#=&gt; #&lt;Date: 2004-11-19 ((2453329j,0s,0n),+0s,2299161j)&gt;
Date.strptime('1100897479', '%s').to_s
#=&gt; "2004-11-19"
DateTime.strptime('1100897479', '%s')
#=&gt; #&lt;DateTime: 2004-11-19T20:51:19+00:00 ((2453329j,75079s,0n),+0s,2299161j)&gt;
DateTime.strptime('1100897479', '%s').to_s
#=&gt; "2004-11-19T20:51:19+00:00"
</code></pre>

Note that you have to <code>require 'date'</code> for that to work, then you can call it either as <code>Date.strptime</code> (if you only care about the date) or <code>DateTime.strptime</code> (if you want date and time). If you need different formatting, you can call <a href="http://www.ruby-doc.org/stdlib-1.9.3/libdoc/date/rdoc/DateTime.html#method-i-strftime" rel="nofollow">DateTime#strftime</a> (look at <a href="http://strftime.net/" rel="nofollow">strftime.net</a> if you have a hard time with the format strings) on it or use one of the built-in methods like <code>rfc822</code>.

blocks|key|325559|text|一旦解析了时间戳字符串并拥有了time对象(有关详细信息，请参阅其他答案)，就可以使用Rails中的Time.to_formatted_s了。它有几种内置的格式，你可以用符号来指定。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|325560|引用：|325561|time+=+Time.now+++++++++++++++++++++#+=>+Thu+Jan+18+06:10:17+CST+2007

time.to_formatted_s(:time)++++++++++#+=>+"06:10"
time.to_s(:time)++++++++++++++++++++#+=>+"06:10"

time.to_formatted_s(:db)++++++++++++#+=>+"2007-01-18+06:10:17"
time.to_formatted_s(:number)++++++++#+=>+"20070118061017"
time.to_formatted_s(:short)+++++++++#+=>+"18+Jan+06:10"
time.to_formatted_s(:long)++++++++++#+=>+"January+18,+2007+06:10"
time.to_formatted_s(:long_ordinal)++#+=>+"January+18th,+2007+06:10"
time.to_formatted_s(:rfc822)++++++++#+=>+"Thu,+18+Jan+2007+06:10:17+-0600"|code-block|syntax|javascript|325562|(Time.to_s是一个别名)|325563|您也可以定义自己的格式-通常在初始化器中(感谢Dave+Newton指出了这一点)。它是这样做的：|325564|#+config/initializers/time_formats.rb
Time::DATE_FORMATS[:month_and_year]+=+"%25B+%25Y"
Time::DATE_FORMATS[:short_ordinal]+=+lambda+{+%7Ctime%7C+time.strftime("%25B+#{time.day.ordinalize}")+}|325565|entityMap|0|LINK|mutability|MUTABLE|url|http://apidock.com/rails/Time/to_formatted_s|1|https://stackoverflow.com/users/438992/dave-newton^0|1E|J|0|0|0|0|0|N|B|1|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@$A|11|B|12|1|13]]|C|$]]|$1|D|3|E|5|6|7|14|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|15|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|16|8|@]|9|@]|C|$]]|$1|M|3|N|5|6|7|17|8|@]|9|@$A|18|B|19|1|1A]]|C|$]]|$1|O|3|P|5|H|7|1B|8|@]|9|@]|C|$I|J]]|$1|Q|3|-4|5|6|7|1C|8|@]|9|@]|C|$]]]|R|$S|$5|T|U|V|C|$W|X]]|Y|$5|T|U|V|C|$W|Z]]]]

Once you have parsed the timestamp string and have a time object (see other answers for details), you can use <a href="http://apidock.com/rails/Time/to_formatted_s" rel="noreferrer">Time.to_formatted_s</a> from Rails. It has several formats built in that you can specify with symbols.

Quote:

<pre><code>time = Time.now # =&gt; Thu Jan 18 06:10:17 CST 2007

time.to_formatted_s(:time) # =&gt; "06:10"
time.to_s(:time) # =&gt; "06:10"

time.to_formatted_s(:db) # =&gt; "2007-01-18 06:10:17"
time.to_formatted_s(:number) # =&gt; "20070118061017"
time.to_formatted_s(:short) # =&gt; "18 Jan 06:10"
time.to_formatted_s(:long) # =&gt; "January 18, 2007 06:10"
time.to_formatted_s(:long_ordinal) # =&gt; "January 18th, 2007 06:10"
time.to_formatted_s(:rfc822) # =&gt; "Thu, 18 Jan 2007 06:10:17 -0600"
</code></pre>

(Time.to_s is an alias)

You can also define your own formats - usually in an initializer (Thanks to <a href="https://stackoverflow.com/users/438992/dave-newton">Dave Newton</a> for pointing this out). This is how it's done:

<pre><code># config/initializers/time_formats.rb
Time::DATE_FORMATS[:month_and_year] = "%B %Y"
Time::DATE_FORMATS[:short_ordinal] = lambda { |time| time.strftime("%B #{time.day.ordinalize}") }
</code></pre>

blocks|key|542620|text|@CMW的答案是金钱上的重击。我已经添加了这个答案作为如何配置初始化器的示例，以便Date和Time对象都能获得格式|type|unstyled|depth|inlineStyleRanges|entityRanges|data|542621|config/initializers/time_formats.rb+s.rb|542622|date_formats+=+{
++concise:+'%25d-%25b-%25Y'+#+13-Jan-2014
}

Time::DATE_FORMATS.merge!+date_formats
Date::DATE_FORMATS.merge!+date_formats|code-block|syntax|javascript|542623|另外，以下两个命令将遍历当前环境中的所有DATE_FORMATS，并以每种格式显示今天的日期和时间：|offset|length|style|CODE|542624|Date::DATE_FORMATS.keys.each{%7Ck%7C+puts+[k,Date.today.to_s(k)].join(':-+')}
Time::DATE_FORMATS.keys.each{%7Ck%7C+puts+[k,Time.now.to_s(k)].join(':-+')}|542625|entityMap^0|0|0|0|K|C|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|V|8|@$K|W|L|X|M|N]]|9|@]|A|$]]|$1|O|3|P|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

@CMW's answer is bang on the money. I've added this answer as an example of how to configure an initializer so that both Date and Time objects get the formatting

config/initializers/time_formats.rb

<pre><code>date_formats = {
 concise: '%d-%b-%Y' # 13-Jan-2014
}

Time::DATE_FORMATS.merge! date_formats
Date::DATE_FORMATS.merge! date_formats
</code></pre>

Also the following two commands will iterate through all the <code>DATE_FORMATS</code> in your current environment, and display today's date and time in each format:

<pre><code>Date::DATE_FORMATS.keys.each{|k| puts [k,Date.today.to_s(k)].join(':- ')}
Time::DATE_FORMATS.keys.each{|k| puts [k,Time.now.to_s(k)].join(':- ')}
</code></pre>

blocks|key|325685|text|了解一下localize或l|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|325686|例如：|325687|l+Time.at(1100897479)|code-block|syntax|javascript|325688|entityMap|0|LINK|mutability|MUTABLE|url|http://www.rubydoc.info/github/svenfuchs/i18n/master/I18n/Backend/Base:localize^0|4|8|D|1|4|8|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|F|3|G|5|6|7|12|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|13|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

Have a look at <a href="http://www.rubydoc.info/github/svenfuchs/i18n/master/I18n/Backend/Base:localize" rel="noreferrer"><code>localize</code></a>, or <code>l</code> 

eg:

<pre><code>l Time.at(1100897479)
</code></pre>

The flickr api provides a posted date as unix timestamp one: "<code>The posted date is always passed around as a unix timestamp, which is an unsigned integer specifying the number of seconds since Jan 1st 1970 GMT.</code>"

For example, here is the date '<code>1100897479</code>'. How do I format it using Ruby on Rails?

Format the date using Ruby on Rails

flickr api提供了一个作为unix时间戳的发布日期："The posted date is always passed around as a unix timestamp, which is an unsigned integer specifying the number of seconds since ...

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