[ruby-core:30672] [Bug #3411] Time.local 1916,5,1 #=> 1916-04-30 23:00:00 +0100

Bug #3411: Time.local 1916,5,1 #=> 1916-04-30 23:00:00 +0100
http://redmine.ruby-lang.org/issues/show/3411

Author: Benoit Daloze
Status: Open, Priority: Normal
Category: core, Target version: 1.9.2
ruby -v: ruby 1.9.3dev (2010-06-08 trunk 28202) [x86_64-darwin10.3.0]

Everything is in the title.

My apologies if this is normal behavior, but I think is not.

It is the only first day of a month of the 20th century to behave like this
(and also the only day in -4000..4000 to not respect Time.local(y,m,d).day == d):
(1901..2000).each { |year|
  (1..12).each { |month|
    p Time.local(year, month, 1) if Time.local(year, month, 1).day != 1
  }
} #=> 1916-04-30 23:00:00 +0100

1.8.7 gives:
Time.local 1916,5,1 #=> Mon May 01 01:00:00 +0200 1916 

I believe this also happen in 1.9.2RC, though I can not test it myself.


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