Demonstration of bug in Rails DateTime.to_i function

date_time_bug.rb

require 'test_helper'

class DateTimeBugTest < ActiveSupport::TestCase

  test "a PDT parsed DateTime should convert to_i and back again" do
    original_date=DateTime.parse('2014-04-05T23:59:59-07:00')
    assert original_date == DateTime.strptime(original_date.to_i.to_s, '%s')
  end

  test "a GMT parsed DateTime should convert to_i and back again" do
    original_date=DateTime.parse('2014-04-05T23:59:59-00:00')
    assert original_date == DateTime.strptime(original_date.to_i.to_s, '%s')
  end

  test "a constructed PDT DateTime should convert to_i and back again" do
    original_date = DateTime.new(2014, 4, 5, 23, 59, 59, Rational(-7, 24))
    assert original_date == DateTime.strptime(original_date.to_i.to_s, '%s')
  end

  test "a constructed GMT DateTime should convert to_i and back again" do
    original_date = DateTime.new(2014, 4, 5, 23, 59, 59)
    assert original_date == DateTime.strptime(original_date.to_i.to_s, '%s')
  end

  test "a constructed PDT DateTime at midnight should convert to_i and back again" do
    original_date = DateTime.new(2014, 4, 5, 0, 0, 0, Rational(-7, 24))
    assert original_date == DateTime.strptime(original_date.to_i.to_s, '%s')
  end

  test "a constructed PDT DateTime at 23:59:00 should convert to_i and back again" do
    original_date = DateTime.new(2014, 4, 5, 23, 59, 0, Rational(-7, 24))
    assert original_date == DateTime.strptime(original_date.to_i.to_s, '%s')
  end

end