Test DST both in local and utc timezone

Also?
Updated failing test.

Author: Alireza Bashiri

activerecord/test/cases/quoting_test.rb

@@ -71,8 +71,8 @@ def test_quoted_time_utc
         with_timezone_config default: :utc do
           t = Time.now.change(usec: 0)
 
-          expected = t.getutc.change(year: 2000, month: 1, day: 1)
-          expected = expected.to_s(:db).sub("2000-01-01 ", "")
+          expected = t.change(year: 2000, month: 1, day: 1)
+          expected = expected.getutc.to_s(:db).slice(11..-1)
 
           assert_equal expected, @quoter.quoted_time(t)
         end
@@ -89,6 +89,28 @@ def test_quoted_time_local
         end
       end
 
+      def test_quoted_time_dst_utc
+        with_timezone_config default: :utc do
+          t = Time.new(2000, 7, 1, 0, 0, 0, "+04:30")
+
+          expected = t.change(year: 2000, month: 1, day: 1)
+          expected = expected.getutc.to_s(:db).slice(11..-1)
+
+          assert_equal expected, @quoter.quoted_time(t)
+        end
+      end
+
+      def test_quoted_time_dst_local
+        with_timezone_config default: :local do
+          t = Time.new(2000, 7, 1, 0, 0, 0, "+04:30")
+
+          expected = t.change(year: 2000, month: 1, day: 1)
+          expected = expected.getlocal.to_s(:db).slice(11..-1)
+
+          assert_equal expected, @quoter.quoted_time(t)
+        end
+      end
+
       def test_quoted_time_crazy
         with_timezone_config default: :asdfasdf do
           t = Time.now.change(usec: 0)