Demonstration of bug in DateTime#to_formatted_s(:rfc822)

datetime_bug results

load '../sketches/datetime_bug.rb'
-- create_table(:test_records, {:force=>true})
NOTICE:  CREATE TABLE will create implicit sequence "test_records_id_seq" for serial column "test_records.id"
NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "test_records_pkey" for table "test_records"
   (237.7ms)  CREATE TABLE "test_records" ("id" serial primary key, "f_datetime" timestamp) 
   -> 0.3416s
   (0.3ms)  BEGIN
  SQL (39.4ms)  INSERT INTO "test_records" ("f_datetime") VALUES ($1) RETURNING "id"  [["f_datetime", Wed, 14 Sep 0763 00:00:00 UTC +00:00]]
   (0.8ms)  COMMIT
  DateTimeBug::TestRecord Load (0.5ms)  SELECT "test_records".* FROM "test_records" LIMIT 1
expected == found => true
expected = Wed, 14 Sep 0763 00:00:00 +0000 (DateTime, Wed, 14 Sep 0763 00:00:00 +0000)
found =    Sat, 14 Sep 0763 00:00:00 +0000 (ActiveSupport::TimeWithZone, Sat, 14 Sep 0763 00:00:00 UTC +00:00)
-- drop_table(:test_records)
   (21.6ms)  DROP TABLE "test_records"
   -> 0.0219s
=> nil

datetime_bug.rb

module DateTimeBug
  extend self

  def up
    ActiveRecord::Schema.define do
      create_table(:test_records, :force => true) do |t|
        t.datetime :f_datetime
      end
    end
  end
  
  def down
    ActiveRecord::Schema.define do
      drop_table :test_records
    end
  end
  
  class TestRecord < ActiveRecord::Base ; end
  
  def do_test
    up

    TestRecord.create!(:f_datetime => (expected = DateTime.jd(2000000)))
    found = TestRecord.first.f_datetime

    puts("expected == found => #{expected == found}")
    puts("expected = #{expected.to_formatted_s(:rfc822)} (#{expected.class}, #{expected.inspect})")
    puts("found =    #{found.to_formatted_s(:rfc822)} (#{found.class}, #{found.inspect})")

    down
  end

  do_test

end