blocks|key|733239|text|如果你有一个ActiveSupport::TimeWithZone对象，你可以对它调用time_zone.utc_offset。例如，Time.zone.now.time_zone.utc_offset。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|733240|编辑:您也可以在普通Time对象上使用gmt_offset实例方法。|733241|entityMap^0|6|R|17|K|1V|Y|0|A|4|J|A|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|I|$]]

If you have a <code>ActiveSupport::TimeWithZone</code> object, you can call <code>time_zone.utc_offset</code> on it. So, for example, <code>Time.zone.now.time_zone.utc_offset</code>.

EDIT: You can also use the <code>gmt_offset</code> instance method on normal <code>Time</code> objects.

blocks|key|949251|text|my_date_time+=+DateTime.new(2011,+3,+29,+20)
#=>+Tue,+29+Mar+2011+20:00:00+%2B0000

#will+return+the+same+time+but+with+another+offset
my_date_time.change(:offset+=>+"%2B0100")
#=>+Tue,+29+Mar+2011+20:00:00+%2B0100

#will+return+time+for+other+offset
my_date_time.in_time_zone(-1)
#=>++Tue,+29+Mar+2011+19:00:00+-0100|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|949252|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>my_date_time = DateTime.new(2011, 3, 29, 20)
#=&gt; Tue, 29 Mar 2011 20:00:00 +0000

#will return the same time but with another offset
my_date_time.change(:offset =&gt; "+0100")
#=&gt; Tue, 29 Mar 2011 20:00:00 +0100

#will return time for other offset
my_date_time.in_time_zone(-1)
#=&gt; Tue, 29 Mar 2011 19:00:00 -0100
</code></pre>

blocks|key|949268|text|require+'time'

p+Time.zone_offset('EST')+#=>+-18000++#(-5*60*60)|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|949269|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>require 'time'

p Time.zone_offset('EST') #=&gt; -18000 #(-5*60*60)
</code></pre>

blocks|key|949342|text|为了完成这里的循环，现在我使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|949343|@course.start.utc_offset/60/60，以便获得所需的小时数。Jquery倒计时只需要在timezone参数中使用-5或%2B3。|offset|length|style|CODE|949344|欢迎使用谷歌。|949345|entityMap^0|0|0|U|1J|8|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]|$D|P|E|Q|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|R|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|K|$]]

Just to complete the loop here, right now I use:

<code>@course.start.utc_offset/60/60</code> in order to get the # of hours needed. Jquery countdown needs just -5 or +3 in their <code>timezone</code> argument.

Your welcome google.

blocks|key|733371|text|如果你需要考虑夏令时，你可以这样使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|733372|Time.now.in_time_zone('America/New_York').utc_offset|code-block|syntax|javascript|733373|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you need to take daylight savings time into account, you can use something like this:

<pre><code>Time.now.in_time_zone('America/New_York').utc_offset
</code></pre>

blocks|key|949454|text|如果您将用户的时区存储为Time.zone.name字符串，如http://api.rubyonrails.org/classes/ActiveSupport/TimeZone.html中所述的'Eastern+Time+(US+&+Canada)'，并希望获得时区偏移量，则可以执行以下操作：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|949455|ActiveSupport::TimeZone.new(user.time_zone).utc_offset+/+3600
#+=>+-5|code-block|syntax|javascript|949456|entityMap|0|LINK|mutability|MUTABLE|url|http://api.rubyonrails.org/classes/ActiveSupport/TimeZone.html^0|C|E|2P|S|V|1Q|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@$9|X|A|Y|1|Z]]|E|$]]|$1|F|3|G|5|H|7|10|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]]]

If you are storing a user's timezone as a <code>Time.zone.name</code> string such as <code>'Eastern Time (US &amp; Canada)'</code> as outlined in <a href="http://api.rubyonrails.org/classes/ActiveSupport/TimeZone.html" rel="noreferrer">http://api.rubyonrails.org/classes/ActiveSupport/TimeZone.html</a> and want to get the timezone offset you can do this:

<pre><code>ActiveSupport::TimeZone.new(user.time_zone).utc_offset / 3600
# =&gt; -5
</code></pre>

blocks|key|949507|text|我使用Time.zone.utc_offset+/+1.hour获取以小时为单位的偏移量(例如:旧金山的-8+)|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|949508|entityMap^0|3|T|1G|2|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

I use <code>Time.zone.utc_offset / 1.hour</code> to get the offset in hours (e.g.: <code>-8</code> for San Francisco)

blocks|key|949565|text|Time.now.in_time_zone('Europe/London').formatted_offset
#+=>+"%2B01:00"|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|949566|对于可以说更有用的字符串...|unstyled|949567|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>Time.now.in_time_zone('Europe/London').formatted_offset
# =&gt; "+01:00"
</code></pre>

For a string arguably more usable...

I need the utc offset from the timezone specified.

问如何获取Rails中的utc偏移量？
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