Issue #9032 has been updated by Andrew White.


This has been fixed in Rails master and will be released as part of Rail 4.1:
https://github.com/rails/rails/commit/63f8fabe4939ad59d597dfea441002ef5b16d2f4

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Bug #9032: Time.round reverts the DST status of the time
https://bugs.ruby-lang.org/issues/9032#change-44864

* Author: Mayank Sharma
* Status: Third Party's Issue
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
* ruby -v: ruby 2.0.0p0 (2013-02-24 revision 39474) [x86_64-darwin11.4.2]
* Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN
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=begin
If the time is in non-DST and round method is applied, then the resulting time goes back to DST time. This happens only during the 1 hour when time goes back. Following example should explain the situation better.

 2.0.0-p0 :057 > d
 => Sun, 27 Oct 2013 02:30:00 CET +01:00
 2.0.0-p0 :058 > d.isdst
 => false
 2.0.0-p0 :059 > d.round(3)
 => Sun, 27 Oct 2013 02:30:00 CEST +02:00
 2.0.0-p0 :060 > d.round(3).isdst
 => true

I have set the priority Urgent as the DST is going to elapse in 10 days from now.
=end




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