From: Rick DeNatale <redmine@...>
Date: 2009-02-07T01:55:46+09:00
Subject: [ruby-core:21894] [Bug #1123] DateTime.<=> is broken

Bug #1123: DateTime.<=> is broken
http://redmine.ruby-lang.org/issues/show/1123

Author: Rick DeNatale
Status: Open, Priority: Normal
ruby -v: ruby 1.8.6 (2007-09-23 patchlevel 110) [i686-darwin8.11.1]

Comparison of date time instances doesn't appear to work correctly.

In the following code the two date times should be equal, but they are not.

The two instance have different ajd values, but I can't determine why

~ >cat rubyscrapbook/date_time_bug.rb 
require 'date'
dt1 = DateTime.parse("1997-12-24T09:00:00+00:00")
dt2 = DateTime.parse("1997-12-24T00:00:00+00:00")
puts "dt1 == dt2 => #{dt1 == dt2}"
puts "dt1 <=> dt2 => #{dt1 <=> dt2}"
puts "dt1 - dt2 => #{dt1 - dt2}"
puts "dt1.sec_fraction #=> #{dt1.sec_fraction}"
puts "dt2.sec_fraction #=> #{dt2.sec_fraction}"
puts "dt1.ajd #=> #{dt1.ajd}"
puts "dt2.ajd #=> #{dt2.ajd}"
~ >ruby rubyscrapbook/date_time_bug.rb 
dt1 == dt2 => false
dt1 <=> dt2 => 1
dt1 - dt2 => 3/8
dt1.sec_fraction #=> 0
dt2.sec_fraction #=> 0
dt1.ajd #=> 19606455/8
dt2.ajd #=> 4901613/2


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