blocks|key|1882789|text|你需要在你的rails应用程序中添加助手来实现这一点。Ruby没有为此提供任何直接的方法。下面是使用ruby+2.1.0的日期操作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1882790|2.1.0+:021+>+a_date_time+=+DateTime.now
+=>+Fri,+26+Dec+2014+16:39:30+%2B0530+#+First+Date
2.1.0+:022+>+b_date_time+=+DateTime.now-20
+=>+Sat,+06+Dec+2014+16:40:03+%2B0530+#+Second+Date
2.1.0+:023+>+(a_date_time+-+b_date_time).to_i
+=>+19+#+Direct+date+difference
2.1.0+:024+>+Seconds+=+((a_date_time+-+b_date_time)*24*60*60).to_i
+=>+1727966+#+Seconds+between+two+dates
2.1.0+:025+>+sec+=+Seconds+%25+60
+=>+26+#+Second+diffence+to+print
2.1.0+:026+>+Minutes+=+Seconds+/+60
+=>+28799+#+Minutes+between+two+dates
2.1.0+:027+>+min+=+Minutes+%25+60
+=>+59+#+Minute+diffence+to+print
2.1.0+:028+>+Hours+=+Minutes+/+60
+=>+479+#+Hours+between+two+dates
2.1.0+:029+>+hour+=+Hours+%25+24
+=>+23+#Hour+diffence+to+print
2.1.0+:030+>+Days+=+Hours+/+24
+=>+19+#+Days+between+two+dates
2.1.0+:032+>+Days.to_s+%2B+'Days,+'+%2B+hour.to_s+%2B+'Hours,+'%2B+min.to_s+%2B+'Mins,+'+%2B+sec.to_s+%2B+'Secs'
+=>+"19Days,+23Hours,+59Mins,+26Secs"+#+Desired+output|code-block|syntax|javascript|1882791|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|$]]

You need to add helper in your rails app to achive this. Ruby not provide any direct way for this. Below is date manipulation using ruby 2.1.0. 

<pre><code>2.1.0 :021 &gt; a_date_time = DateTime.now
 =&gt; Fri, 26 Dec 2014 16:39:30 +0530 # First Date
2.1.0 :022 &gt; b_date_time = DateTime.now-20
 =&gt; Sat, 06 Dec 2014 16:40:03 +0530 # Second Date
2.1.0 :023 &gt; (a_date_time - b_date_time).to_i
 =&gt; 19 # Direct date difference
2.1.0 :024 &gt; Seconds = ((a_date_time - b_date_time)*24*60*60).to_i
 =&gt; 1727966 # Seconds between two dates
2.1.0 :025 &gt; sec = Seconds % 60
 =&gt; 26 # Second diffence to print
2.1.0 :026 &gt; Minutes = Seconds / 60
 =&gt; 28799 # Minutes between two dates
2.1.0 :027 &gt; min = Minutes % 60
 =&gt; 59 # Minute diffence to print
2.1.0 :028 &gt; Hours = Minutes / 60
 =&gt; 479 # Hours between two dates
2.1.0 :029 &gt; hour = Hours % 24
 =&gt; 23 #Hour diffence to print
2.1.0 :030 &gt; Days = Hours / 24
 =&gt; 19 # Days between two dates
2.1.0 :032 &gt; Days.to_s + 'Days, ' + hour.to_s + 'Hours, '+ min.to_s + 'Mins, ' + sec.to_s + 'Secs'
 =&gt; "19Days, 23Hours, 59Mins, 26Secs" # Desired output
</code></pre>

blocks|key|6050232|text|我喜欢使用gem+time_diff|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|6050233|https://github.com/abhidsm/time_diff|6050234|以下是它的工作原理示例|6050235|+++Time.diff(Time.parse('2011-03-06'),+Time.parse('2011-03-07'))
+++#+=>+{:year+=>+0,+:month+=>+0,+:week+=>+0,+:day+=>+1,+:hour+=>+0,+:minute+=>+0,+:second+=>+0,+:diff+=>+'1+day+and+00:00:00'}|code-block|syntax|javascript|6050236|entityMap|0|LINK|mutability|MUTABLE|url^0|9|9|0|0|10|0|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Y|8|@]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|H|3|I|5|6|7|12|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|13|8|@]|D|@]|E|$M|N]]|$1|O|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|G]]]]

I like to use the gem <code>time_diff</code>

<a href="https://github.com/abhidsm/time_diff" rel="noreferrer">https://github.com/abhidsm/time_diff</a>

Here is a example how it works

<pre><code> Time.diff(Time.parse('2011-03-06'), Time.parse('2011-03-07'))
 # =&gt; {:year =&gt; 0, :month =&gt; 0, :week =&gt; 0, :day =&gt; 1, :hour =&gt; 0, :minute =&gt; 0, :second =&gt; 0, :diff =&gt; '1 day and 00:00:00'}
</code></pre>

blocks|key|6050277|text|另一种方法是使用ActionView帮助程序distance_of_time_in_words+(参见documentation)。如果通常不给出确切的小单位，而是类似于“大约5天”。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|6050278|entityMap|0|LINK|mutability|MUTABLE|url|http://api.rubyonrails.org/classes/ActionView/Helpers/DateHelper.html#method-i-distance_of_time_in_words^0|8|A|M|P|1F|D|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]|$9|Q|A|R|B|C]]|D|@$9|S|A|T|1|U]]|E|$]]|$1|F|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

An alternative could be to use the <code>ActionView</code> helper <code>distance_of_time_in_words</code> (see the <a href="http://api.rubyonrails.org/classes/ActionView/Helpers/DateHelper.html#method-i-distance_of_time_in_words" rel="noreferrer">documentation</a>). If normally does not give the exact minor units, but something like "around 5 days".

blocks|key|1882828|text|给定的值是有理数(http://www.ruby-doc.org/core-2.1.5/Rational.html)。它表示两个日期之间的天数。这实际上非常酷，因为它可以比浮点数更精确，并且可以很容易地转换为小时、分钟、秒等。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1882829|entityMap|0|LINK|mutability|MUTABLE|url|http://www.ruby-doc.org/core-2.1.5/Rational.html^0|9|1C|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

The value that is being given is a Rational, (<a href="http://www.ruby-doc.org/core-2.1.5/Rational.html" rel="nofollow">http://www.ruby-doc.org/core-2.1.5/Rational.html</a>). It represents the number of days between the two dates. This is actually quite cool, as it can be much more accurate than a float and easily convertible to hours, minutes, seconds etc.

How to get time difference in <code>days,hours,mins</code>

I am trying to do 

<pre><code>datetime_A - datetime_B
</code></pre>

<code>datetime_A</code> = Sat, 04 Jan 2014 07:00:13 +0000

<code>datetime_B</code> = Fri, 03 Jan 2014 01:09:46 +0000

it returns me something like<code>(35809/28800)</code>,bdw what does it means?

I need like <code>1day,5h,23min</code>

How can do it?

Rails get difference between two dates

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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如何在days,hours,mins中获取时间差我正在试着做datetime_A - datetime_Bdatetime_A = Sat，04 Jan 2014 07:00:13 +0000datetime_B = Fri，03 Jan 2014 01:09:46 +0000它返回像(35809/28800)，bdw...

问Rails获取两个日期之间的差异
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