From: Benoit Daloze <eregontp@...>
Date: 2010-06-09T06:06:15+09:00
Subject: [ruby-core:30677] Re: [Bug #3411] Time.local 1916,5,1 #=> 	1916-04-30 23:00:00 +0100

> Then maybe it is a platform problem
> or a zone problem (you are in -5, so it is likely not happening).
> Could someone checks on OSX with trunk and 1.9.2 ?
>
> For my part I still get:
> $ ruby -e 'p Time.local 1916,5,1'
> 1916-04-30 23:00:00 +0100

To clarify the problem: (first build from adding a day(86400), second
from Time.local)
> 5.times {|i| t=Time.local(1916,4,29)+i*86400; p t; d=i>1 ? Time.local(1916,5,i-1) : Time.local(1916,4,29+i); p d; puts}
1916-04-29 00:00:00 +0100
1916-04-29 00:00:00 +0100

1916-04-30 00:00:00 +0100
1916-04-30 00:00:00 +0100

# So the time zone changes, and this probably cause the bug.
1916-05-01 01:00:00 +0200
1916-04-30 23:00:00 +0100

1916-05-02 01:00:00 +0200
1916-05-02 00:00:00 +0200

1916-05-03 01:00:00 +0200
1916-05-03 00:00:00 +0200