Fix ActiveSupport::TimeWithZone#localtime method with DateTime

[#5344 state:committed]

Signed-off-by: Santiago Pastorino <santiago@wyeworks.com>

activesupport/lib/active_support/time_with_zone.rb

@@ -73,7 +73,7 @@ def in_time_zone(new_zone = ::Time.zone)
 
     # Returns a <tt>Time.local()</tt> instance of the simultaneous time in your system's <tt>ENV['TZ']</tt> zone
     def localtime
-      utc.getlocal
+      utc.is_a?(DateTime) ? utc.to_time.getlocal : utc.getlocal
     end
     alias_method :getlocal, :localtime
 

activesupport/test/core_ext/time_with_zone_test.rb

@@ -36,6 +36,10 @@ def test_in_time_zone_with_new_zone_equal_to_old_zone_does_not_create_new_object
     assert_equal @twz.object_id, @twz.in_time_zone(ActiveSupport::TimeZone['Eastern Time (US & Canada)']).object_id
   end
 
+  def test_localtime
+    assert_equal @twz.localtime, @twz.utc.getlocal
+  end
+
   def test_utc?
     assert_equal false, @twz.utc?
     assert_equal true, ActiveSupport::TimeWithZone.new(Time.utc(2000), ActiveSupport::TimeZone['UTC']).utc?
@@ -763,6 +767,13 @@ def test_in_time_zone_with_time_local_instance
     end
   end
 
+  def test_localtime
+    Time.zone_default = ActiveSupport::TimeZone['Eastern Time (US & Canada)']
+    assert_equal @dt.in_time_zone.localtime, @dt.in_time_zone.utc.to_time.getlocal
+  ensure
+    Time.zone_default = nil
+  end
+
   def test_use_zone
     Time.zone = 'Alaska'
     Time.use_zone 'Hawaii' do