[ruby-core:74189] [Ruby trunk Bug#12147] Time::local returns incorrect ending of US DST

From: mitchellryanj@...
Date: 2016-03-07 04:27:49 UTC
List: ruby-core #74189
Issue #12147 has been reported by Ryan Mitchell.

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Bug #12147: Time::local returns incorrect ending of US DST
https://bugs.ruby-lang.org/issues/12147

* Author: Ryan Mitchell
* Status: Open
* Priority: Normal
* Assignee: Akira Tanaka
* ruby -v: ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-darwin14]
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
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In 2016, US Daylight Saving Time ends at 2:00 AM on November 6. In the America/Los_Angeles timezone, this means going from an offset from UTC of -0700 to an offset of -0800. So 1:00 AM on that date is still in DST, with an offset from UTC of -0700. But Time::local begins returning the new offset at 1:00 AM instead of 2:00 AM. The offset of times at midnight and at 2:00 AM are returned correctly:

~~~
2.3.0 :020 > Time.local(2016, 11, 6, 0)
 => 2016-11-06 00:00:00 -0700
2.3.0 :021 > Time.local(2016, 11, 6, 1)
 => 2016-11-06 01:00:00 -0800
2.3.0 :022 > Time.local(2016, 11, 6, 2)
 => 2016-11-06 02:00:00 -0800
~~~

This behaves correctly in Ruby 2.2.0 and it looks possibly related to https://bugs.ruby-lang.org/issues/10698.



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