fixed a bug in the test suite. Thanks Benoit Daloze! [ruby-core:34641]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@30627 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/psych/test_json_tree.rb

@@ -41,8 +41,9 @@ module Psych
     end
 
     def test_time
-      time = Time.new(2010, 10, 10).utc
-      assert_equal "{\"a\": \"2010-10-10 07:00:00.000000000Z\"}\n", Psych.to_json({'a' => time })
+      time = Time.utc(2010, 10, 10)
+      assert_equal "{\"a\": \"2010-10-10 00:00:00.000000000Z\"}\n",
+Psych.to_json({'a' => time })
     end
 
     def test_datetime