unless File.exist?('Gemfile')
  File.write('Gemfile', <<-GEMFILE)
    source 'https://rubygems.org'
    gem 'rails', '4.0.2'
    gem 'pg'
  GEMFILE
 
  system 'bundle'
end
 
require 'bundler'
Bundler.setup(:default)
 
require 'active_record'
require 'minitest/autorun'
require 'logger'
 
# This connection will do for database-independent bug reports.
ActiveRecord::Base.establish_connection(
  adapter: 'postgresql',
  encoding: 'utf8',
  database: 'kd_test',
  username: 'postgres',
  password: '',
  host: 'localhost'
  )
ActiveRecord::Base.logger = Logger.new(STDOUT)
 
ActiveRecord::Schema.define do
 
  create_table :sql_arrays, force: true do |t|
    t.timestamp :timestamps, array: true, default: []
    t.date :dates, array: true, default: []

    t.timestamps
  end
end
 
class SqlArray < ActiveRecord::Base
  self.time_zone_aware_attributes = true
end
 
class BugTest < MiniTest::Unit::TestCase

  def test_timestamp_array
    current_time = Time.new
    a = SqlArray.create(timestamps: [current_time])

    assert_equal [current_time], a.timestamps
  end
end


OUTPUT:
# =>
-- create_table(:sql_arrays, {:force=>true})
D, [2014-01-08T01:47:07.950467 #41398] DEBUG -- :    (3.9ms)  DROP TABLE "sql_arrays"
D, [2014-01-08T01:47:07.958553 #41398] DEBUG -- :    (7.8ms)  CREATE TABLE "sql_arrays" ("id" serial primary key, "timestamps" timestamp[] DEFAULT '{}', "dates" date[] DEFAULT '{}', "created_at" timestamp, "updated_at" timestamp) 
   -> 0.0355s
/Users/kd/.rvm/gems/ruby-1.9.3-p484/gems/minitest-4.7.5/lib/minitest/unit.rb:19:in `const_missing': uninitialized constant MiniTest::Test (NameError)
	from #13402.rb:43:in `<main>'
KDs-MacBook-Pro:rails_issues kd$  ruby \#13402.rb 
-- create_table(:sql_arrays, {:force=>true})
D, [2014-01-08T01:47:26.494691 #41410] DEBUG -- :    (3.5ms)  DROP TABLE "sql_arrays"
D, [2014-01-08T01:47:26.501441 #41410] DEBUG -- :    (6.4ms)  CREATE TABLE "sql_arrays" ("id" serial primary key, "timestamps" timestamp[] DEFAULT '{}', "dates" date[] DEFAULT '{}', "created_at" timestamp, "updated_at" timestamp) 
   -> 0.0273s
Run options: --seed 53808

# Running tests:

D, [2014-01-08T01:47:26.512277 #41410] DEBUG -- :    (0.2ms)  BEGIN
D, [2014-01-08T01:47:26.519440 #41410] DEBUG -- :   SQL (4.3ms)  INSERT INTO "sql_arrays" ("created_at", "timestamps", "updated_at") VALUES ($1, $2, $3) RETURNING "id"  [["created_at", 2014-01-07 20:17:26 UTC], ["timestamps", nil], ["updated_at", 2014-01-07 20:17:26 UTC]]
D, [2014-01-08T01:47:26.520173 #41410] DEBUG -- :    (0.4ms)  COMMIT
F

Finished tests in 0.024402s, 40.9802 tests/s, 40.9802 assertions/s.

  1) Failure:
BugTest#test_timestamp_array [#13402.rb:49]:
Expected: [2014-01-08 01:47:26 +0530]
  Actual: nil

1 tests, 1 assertions, 1 failures, 0 errors, 0 skips