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 ---------------------------------------- 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 ---------------------------------------- =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 -- http://bugs.ruby-lang.org/