blocks|key|739931|text|Date#beginning_of_day将始终返回00:00。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|739932|但据我所知，你想知道其他时区的时间，而在当前时区是一天的开始。|739933|所以。让我们来看看你现在所在的地方一天的开始。想象这里是法国的巴黎：|739934|bd+=+DateTime.now.in_time_zone('Paris').beginning_of_day
#+or+just
bd+=+DateTime.now.in_time_zone(1).beginning_of_day
#=>+Thu,+24+Mar+2011+00:00:00+WET+%2B01:00|code-block|syntax|javascript|739935|现在让我们来看看莫斯科的时间是什么：|739936|moscow_time+=+bd.in_time_zone("Moscow")+#+or+in_time_zone(3)
#=>+Thu,+24+Mar+2011+02:00:00+AST+%2B03:00
london_time+=+bd.in_time_zone("London")
#=>+Wed,+23+Mar+2011+23:00:00+GMT+%2B00:00
kyiv_time+=+bd.in_time_zone("Kyiv")
#=>+Thu,+24+Mar+2011+01:00:00+EET+%2B02:00+|739937|对于不同的form+now日期：|739938|#+You+even+shouldn't+call+now,+because+it+by+default+will+be+00:00
date+=+DateTime(2011,+1,+3).in_time_zone("-10")
#+or
date+=+DateTime.new(2011,1,3,0,0,0,"-10")
#+and+same+way+as+above
moscow_time+=+date.in_time_zone("Moscow")+#+or+in_time_zone(3)|739939|并将Date转换为DateTime|739940|date+=+Date.new(2011,1,3).to_datetime.change(:offset+=>+"EST")|739941|entityMap^0|0|L|0|0|0|0|0|0|A|3|0|0|2|4|9|8|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@$9|13|A|14|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|15|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|16|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|17|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|18|8|@]|D|@]|E|$]]|$1|Q|3|R|5|L|7|19|8|@]|D|@]|E|$M|N]]|$1|S|3|T|5|6|7|1A|8|@$9|1B|A|1C|B|C]]|D|@]|E|$]]|$1|U|3|V|5|L|7|1D|8|@]|D|@]|E|$M|N]]|$1|W|3|X|5|6|7|1E|8|@$9|1F|A|1G|B|C]|$9|1H|A|1I|B|C]]|D|@]|E|$]]|$1|Y|3|Z|5|L|7|1J|8|@]|D|@]|E|$M|N]]|$1|10|3|-4|5|6|7|1K|8|@]|D|@]|E|$]]]|11|$]]

<code>Date#beginning_of_day</code> will always return 00:00.

But as I understand you want to know time in other time zone while in current time zone is beginning of the day.

So. Let's find out beginning of the day in your current place. Imagine it is Paris, France:

<pre><code>bd = DateTime.now.in_time_zone('Paris').beginning_of_day
# or just
bd = DateTime.now.in_time_zone(1).beginning_of_day
#=&gt; Thu, 24 Mar 2011 00:00:00 WET +01:00
</code></pre>

Now lets found out what time is in Moscow:

<pre><code>moscow_time = bd.in_time_zone("Moscow") # or in_time_zone(3)
#=&gt; Thu, 24 Mar 2011 02:00:00 AST +03:00
london_time = bd.in_time_zone("London")
#=&gt; Wed, 23 Mar 2011 23:00:00 GMT +00:00
kyiv_time = bd.in_time_zone("Kyiv")
#=&gt; Thu, 24 Mar 2011 01:00:00 EET +02:00 
</code></pre>

For different form <code>now</code> day:

<pre><code># You even shouldn't call now, because it by default will be 00:00
date = DateTime(2011, 1, 3).in_time_zone("-10")
# or
date = DateTime.new(2011,1,3,0,0,0,"-10")
# and same way as above
moscow_time = date.in_time_zone("Moscow") # or in_time_zone(3)
</code></pre>

and converting <code>Date</code> to <code>DateTime</code>

<pre><code>date = Date.new(2011,1,3).to_datetime.change(:offset =&gt; "EST")
</code></pre>

blocks|key|955919|text|time_zone+=+Time.zone+#+any+time+zone+really
time_zone.local(date.year,+date.month,+date.day)|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|955920|问题是，Date.beginning_of_day不支持ActiveSupport+2.3中的Time.zone|unstyled|offset|length|style|CODE|955921|比较https://github.com/rails/rails/blob/v2.3.11/activesupport/lib/active_support/core_ext/date/calculations.rb#L64+(AS+2.3)|955922|至https://github.com/rails/rails/blob/master/activesupport/lib/active_support/core_ext/date/calculations.rb#L74和https://github.com/rails/rails/blob/master/activesupport/lib/active_support/core_ext/date/zones.rb#L7+(AS+3)|955923|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/rails/rails/blob/v2.3.11/activesupport/lib/active_support/core_ext/date/calculations.rb#L64|1|https://github.com/rails/rails/blob/master/activesupport/lib/active_support/core_ext/date/calculations.rb#L74|2|https://github.com/rails/rails/blob/master/activesupport/lib/active_support/core_ext/date/zones.rb#L7^0|0|4|L|1B|9|0|2|32|0|0|1|31|1|33|2T|2|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|11|8|@$G|12|H|13|I|J]|$G|14|H|15|I|J]]|9|@]|A|$]]|$1|K|3|L|5|F|7|16|8|@]|9|@$G|17|H|18|1|19]]|A|$]]|$1|M|3|N|5|F|7|1A|8|@]|9|@$G|1B|H|1C|1|1D]|$G|1E|H|1F|1|1G]]|A|$]]|$1|O|3|-4|5|F|7|1H|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]|W|$5|R|S|T|A|$U|X]]|Y|$5|R|S|T|A|$U|Z]]]]

<pre><code>time_zone = Time.zone # any time zone really
time_zone.local(date.year, date.month, date.day)
</code></pre>

Problem is, <code>Date.beginning_of_day</code> does not honor <code>Time.zone</code> in ActiveSupport 2.3

Compare <a href="https://github.com/rails/rails/blob/v2.3.11/activesupport/lib/active_support/core_ext/date/calculations.rb#L64" rel="noreferrer">https://github.com/rails/rails/blob/v2.3.11/activesupport/lib/active_support/core_ext/date/calculations.rb#L64</a> (AS 2.3) 

to <a href="https://github.com/rails/rails/blob/master/activesupport/lib/active_support/core_ext/date/calculations.rb#L74" rel="noreferrer">https://github.com/rails/rails/blob/master/activesupport/lib/active_support/core_ext/date/calculations.rb#L74</a>
and
<a href="https://github.com/rails/rails/blob/master/activesupport/lib/active_support/core_ext/date/zones.rb#L7" rel="noreferrer">https://github.com/rails/rails/blob/master/activesupport/lib/active_support/core_ext/date/zones.rb#L7</a>
(AS 3)

blocks|key|740006|text|DateTime.now.in_time_zone(Time.zone).beginning_of_day|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|740007|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>DateTime.now.in_time_zone(Time.zone).beginning_of_day
</code></pre>

blocks|key|740016|text|ActiveSupport::TimeZone['Europe/London'].parse('30.07.2013')+#+2013-07-29+23:00:00+UTC+
ActiveSupport::TimeZone['Asia/Magadan'].parse('30.07.2013')+#+2013-07-29+12:00:00+UTC|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|740017|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>ActiveSupport::TimeZone['Europe/London'].parse('30.07.2013') # 2013-07-29 23:00:00 UTC 
ActiveSupport::TimeZone['Asia/Magadan'].parse('30.07.2013') # 2013-07-29 12:00:00 UTC
</code></pre>

blocks|key|956043|text|正如列昂尼德·舍夫佐夫提到的，Date.beginning_of_day在ActiveSupport+2.3中不支持Time.zone|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|956044|如果你坚持使用Rails4.0或ActiveSupport+2.3，并且你需要使用一个自定义的日期，那么我使用的是一个替代方案：|956045|date+=+Date.new(2014,10,29)
date.to_time.change(hour:+0,+min:+0,+sec:+0).in_time_zone++#.beginning_of_day
date.to_time.change(hour:+23,+min:+59,+sec:+59).in_time_zone+#.end_of_day|code-block|syntax|javascript|956046|结果：|956047|2.0.0-p247+:001+>+date+=+Date.new(2014,10,29)
+=>+Wed,+29+Oct+2014+

2.0.0-p247+:002+>+date.to_time.change(hour:+0,+min:+0,+sec:+0)
+=>+2014-10-29+00:00:00+-0500+

2.0.0-p247+:003+>+date.to_time.change(hour:+0,+min:+0,+sec:+0).in_time_zone
+=>+Wed,+29+Oct+2014+05:00:00+UTC+%2B00:00+

2.0.0-p247+:004+>+date.to_time.change(hour:+23,+min:+59,+sec:+59)
+=>+2014-10-29+23:59:59+-0500+

2.0.0-p247+:005+>+date.to_time.change(hour:+23,+min:+59,+sec:+59).in_time_zone
+=>+Thu,+30+Oct+2014+04:59:59+UTC+%2B00:00+|956048|我最初使用.beginning_of_day+to+.end_of_day的失败模型作用域无法工作：|956049|scope+:on_day,+->(date)+{+where(+created_at:+date.beginning_of_day..date.end_of_day+)+}|956050|这就是修复它的方法，因为我不能升级到Rails4.0|956051|scope+:on_day,+->(date)+{+where(+created_at:+date.to_time.change(hour:+0,+min:+0,+sec:+0).in_time_zone..date.to_time.change(hour:+23,+min:+59,+sec:+59).in_time_zone+)+}|956052|entityMap^0|F|L|1M|9|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]|$9|13|A|14|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|15|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|16|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|17|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|18|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|19|8|@]|D|@]|E|$]]|$1|S|3|T|5|J|7|1A|8|@]|D|@]|E|$K|L]]|$1|U|3|V|5|6|7|1B|8|@]|D|@]|E|$]]|$1|W|3|X|5|J|7|1C|8|@]|D|@]|E|$K|L]]|$1|Y|3|-4|5|6|7|1D|8|@]|D|@]|E|$]]]|Z|$]]

As Leonid Shevtsov mentioned, <code>Date.beginning_of_day</code> does not honor <code>Time.zone</code> in ActiveSupport 2.3

An alternative I used, if your stuck using Rails 4.0 or ActiveSupport 2.3, and you need to use a custom date:

<pre><code>date = Date.new(2014,10,29)
date.to_time.change(hour: 0, min: 0, sec: 0).in_time_zone #.beginning_of_day
date.to_time.change(hour: 23, min: 59, sec: 59).in_time_zone #.end_of_day
</code></pre>

Results:

<pre><code>2.0.0-p247 :001 &gt; date = Date.new(2014,10,29)
 =&gt; Wed, 29 Oct 2014 

2.0.0-p247 :002 &gt; date.to_time.change(hour: 0, min: 0, sec: 0)
 =&gt; 2014-10-29 00:00:00 -0500 

2.0.0-p247 :003 &gt; date.to_time.change(hour: 0, min: 0, sec: 0).in_time_zone
 =&gt; Wed, 29 Oct 2014 05:00:00 UTC +00:00 

2.0.0-p247 :004 &gt; date.to_time.change(hour: 23, min: 59, sec: 59)
 =&gt; 2014-10-29 23:59:59 -0500 

2.0.0-p247 :005 &gt; date.to_time.change(hour: 23, min: 59, sec: 59).in_time_zone
 =&gt; Thu, 30 Oct 2014 04:59:59 UTC +00:00 
</code></pre>

My original failed model scope using .beginning_of_day to .end_of_day failed to work:

<pre><code>scope :on_day, -&gt;(date) { where( created_at: date.beginning_of_day..date.end_of_day ) }
</code></pre>

And, this is what fixed it, since I could not upgrade to Rails 4.0

<pre><code>scope :on_day, -&gt;(date) { where( created_at: date.to_time.change(hour: 0, min: 0, sec: 0).in_time_zone..date.to_time.change(hour: 23, min: 59, sec: 59).in_time_zone ) }
</code></pre>

blocks|key|956106|text|离开Peder的回答，以下是我为PST时区所做的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|956107|DateTime.now.in_time_zone("Pacific+Time+(US+&+Canada)").beginning_of_day|code-block|syntax|javascript|956108|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|$]]

Going off Peder's answer, here's what I did for the PST time zone:

<pre><code>DateTime.now.in_time_zone("Pacific Time (US &amp; Canada)").beginning_of_day
</code></pre>

blocks|key|740197|text|我知道这篇文章很老了，但是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|740198|Time.zone.parse("12am")|code-block|syntax|javascript|740199|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|$]]

I know this post is old, but what about:

<pre><code>Time.zone.parse("12am")
</code></pre>

I have a default time zone setup for the rails application.
And an instance of the Date object.

How can I get make Date#beginning_of_day to return the beginning of the day in the specified time zone, but not my local timezone.

Is there any other method to get beginning of the day time in the specified timezone for the given date?

<pre><code>date = Date.new(2014,10,29)

zone = ActiveSupport::TimeZone.new('CET')
date.foo(zone) # should return "Wed, 29 Oct 2014 00:00:00 CET +01:00"

zone = ActiveSupport::TimeZone.new('UTC')
date.foo(zone) # should return "Wed, 29 Oct 2014 00:00:00 UTC +00:00"
</code></pre>

Rails: get #beginning_of_day in time zone

我为rails应用程序设置了一个默认时区。和Date对象的一个实例。如何让make Date#beginning_of_day返回指定时区中一天的开始，而不是我当地的时区。有没有其他方法可以在指定的时区中获取给定日期的开始时间？date = Date.new(2014,10,29)zone = ActiveSuppor...

问Rails:获取时区中的#beginning_of_day
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