diff --git a/app/controllers/main_controller.rb b/app/controllers/main_controller.rb
--- a/app/controllers/main_controller.rb
+++ b/app/controllers/main_controller.rb
@@ -41,7 +41,7 @@
       @submission.source = params['file'].read 
       @submission.source_filename = params['file'].original_filename
     end
-    @submission.submitted_at = Time.new
+    @submission.submitted_at = Time.new.gmtime
 
     if user.site!=nil and user.site.finished?
       @submission.errors.add_to_base "The contest is over."
diff --git a/app/models/site.rb b/app/models/site.rb
--- a/app/models/site.rb
+++ b/app/models/site.rb
@@ -18,7 +18,7 @@
     if tmatch = /(\d+):(\d+)/.match(contest_time)
       h = tmatch[1].to_i
       m = tmatch[2].to_i
-      return Time.now > (self.start_time + h.hour + m.minute)
+      return Time.now.gmtime > (self.start_time + h.hour + m.minute)
     else
       false
     end
diff --git a/app/models/test_request.rb b/app/models/test_request.rb
--- a/app/models/test_request.rb
+++ b/app/models/test_request.rb
@@ -82,7 +82,7 @@
                              "#{test_request.input_file_name}.files")
       end
     end
-    test_request.submitted_at = Time.new
+    test_request.submitted_at = Time.new.gmtime
     test_request.status_inqueue
     test_request
   end