Accessing datetime via read_attribute loses timezone

In my project I needed to alter getter method for datetime attribute, like that:

class SomeModel < ActiveRecord::Base
  has_one :overriding_model
  def start_time
    if overriding_model
      overriding_model.start_time
    else
      read_attribute(:start_time)
    end
  end
end

With such definition start_time method began to return instances of Time class (with time in UTC timezone), so that broke displaying of times for us.

Here's diff to test case that will fail test_time_attributes_are_retrieved_in_current_time_zone

diff --git a/activerecord/test/cases/attribute_methods_test.rb b/activerecord/test/cases/attribute_methods_test.rb
index 77ee8d8..cc5198f 100644
--- a/activerecord/test/cases/attribute_methods_test.rb
+++ b/activerecord/test/cases/attribute_methods_test.rb
@@ -146,7 +146,9 @@ class AttributeMethodsTest < ActiveRecord::TestCase
       record[:written_on] = utc_time
       assert_equal utc_time, record.written_on # record.written on is equal to (i.e., simultaneous with) utc_time
       assert_kind_of ActiveSupport::TimeWithZone, record.written_on # but is a TimeWithZone
+      assert_kind_of ActiveSupport::TimeWithZone, record.read_attribute(:written_on)
       assert_equal ActiveSupport::TimeZone["Pacific Time (US & Canada)"], record.written_on.time_zone # and is in the current Time.zone
+      assert_equal ActiveSupport::TimeZone["Pacific Time (US & Canada)"], record.read_attribute(:written_on).time_zone
       assert_equal Time.utc(2007, 12, 31, 16), record.written_on.time # and represents time values adjusted accordingly
     end
   end