diff --git a/app/models/site.rb b/app/models/site.rb
new file mode 100644
--- /dev/null
+++ b/app/models/site.rb
@@ -0,0 +1,24 @@
+class Site < ActiveRecord::Base
+
+  def clear_start_time_if_not_started
+    if !self.started
+      self.start_time = nil
+    end
+  end
+
+  def finished?
+    if !self.started
+      return false
+    end
+
+    contest_time = Configuration['contest.time_limit']
+    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)
+    else
+      false
+    end
+  end
+
+end