Issue #5988 has been reported by Dylan Markow.

----------------------------------------
Bug #5988: Time class interprets "2012-02-30" as "2012-03-01"
https://bugs.ruby-lang.org/issues/5988

Author: Dylan Markow
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 
ruby -v: ruby 2.0.0dev (2012-02-09 trunk 34499) [x86_64-darwin11.3.0]


=begin
The time class seems to accept any number from 1-31 as a valid day for any month of the year, even if the month has less than 31 days. If the day exceeds the number of days, it just spills over into the following month; "2012-02-30" become "2012-03-01", "2012-04-31" becomes "2012-05-01", and so on. It's not until you try 32 as a day number that you get the expected Argument Error. This happens with Time.new, Time.parse, Time.local, Time.utc, etc.

 irb(main):002:0> RUBY_DESCRIPTION
 => "ruby 2.0.0dev (2012-02-09 trunk 34499) [x86_64-darwin11.3.0]"
 irb(main):003:0> Time.parse "2012-02-30"
 => 2012-03-01 00:00:00 -0800
 irb(main):004:0> Time.new 2012, 2, 30
 => 2012-03-01 00:00:00 -0800
 irb(main):005:0> Time.local 2012, 2, 30
 => 2012-03-01 00:00:00 -0800
 irb(main):006:0> Time.utc 2012, 2, 30
 => 2012-03-01 00:00:00 UTC
 irb(main):007:0> Time.new 2012, 4, 31
 => 2012-05-01 00:00:00 -0700
 irb(main):008:0> Time.new 2012, 2, 32
 ArgumentError: argument out of range
 	from (irb):8:in `initialize'
 	from (irb):8:in `new'
 	from (irb):8
 	from /Users/dylan/.rbenv/versions/2.0.0-dev/bin/irb:12:in `<main>'
 irb(main):009:0> 
 
=end



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