diff --git a/test/test_helper.rb b/test/test_helper.rb
index 61925e3a..6dab8278 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -48,7 +48,7 @@ def a_time_stack_item
     end
   
     def assert_date_times_equal(dt1, dt2)
-      assert_equal dt1, dt2, "Failed for timezone: #{ENV['TZ']}: #{dt1.to_s} not equal to #{dt2.to_s}"
+      assert_in_delta dt1.to_time.to_f, dt2.to_time.to_f, 0.01, "Failed for timezone: #{ENV['TZ']}: #{dt1.to_s} not equal to #{dt2.to_s}"
     end
     
 end
diff --git a/test/time_stack_item_test.rb b/test/time_stack_item_test.rb
index 3c31bdf1..4ac66852 100644
--- a/test/time_stack_item_test.rb
+++ b/test/time_stack_item_test.rb
@@ -113,6 +113,19 @@ def test_utc_offset_to_rational
     assert_equal Rational(1, 24),  a_time_stack_item.send(:utc_offset_to_rational, 3600)
   end
 
+  def test_datetime_in_presence_of_activesupport_timezone
+    skip('requires ActiveSupport') unless Time.respond_to? :zone
+    backed_up_zone, backed_up_tzvar = Time.zone, ENV['TZ']
+
+    Time.zone = ENV['TZ'] = 'America/Los_Angeles'
+    t = DateTime.new(2001, 2, 28, 23, 59, 59.5)
+    tsi = Timecop::TimeStackItem.new(:freeze, t)
+
+    assert_date_times_equal t, tsi.datetime
+  ensure
+    Time.zone, ENV['TZ'] = backed_up_zone, backed_up_tzvar
+  end
+
   # Ensure DateTimes handle changing DST properly
   def test_datetime_for_dst_to_non_dst
     Timecop.freeze(DateTime.parse("2009-12-1 00:38:00 -0500"))