Index: lams_monitoring/src/java/org/lamsfoundation/lams/monitoring/service/MonitoringService.java
===================================================================
diff -u -r8ff342a424c47f78303c3224966eb319dd28f1e4 -rfe1357c8a7b5215967bb22c5f19fbb9788148bf9
--- lams_monitoring/src/java/org/lamsfoundation/lams/monitoring/service/MonitoringService.java	(.../MonitoringService.java)	(revision 8ff342a424c47f78303c3224966eb319dd28f1e4)
+++ lams_monitoring/src/java/org/lamsfoundation/lams/monitoring/service/MonitoringService.java	(.../MonitoringService.java)	(revision fe1357c8a7b5215967bb22c5f19fbb9788148bf9)
@@ -1398,6 +1398,7 @@
     private void runGateScheduler(ScheduleGateActivity scheduleGate,
                                   Date lessonStartTime)
     {
+    	
         if(log.isDebugEnabled())
             log.debug("Running scheduler for gate "+scheduleGate.getActivityId()+"...");
         JobDetail openScheduleGateJob = getOpenScheduleGateJob();
@@ -1407,18 +1408,29 @@
         openScheduleGateJob.getJobDataMap().put("gateId",scheduleGate.getActivityId());
         closeScheduleGateJob.setName("closeGate");
         closeScheduleGateJob.getJobDataMap().put("gateId",scheduleGate.getActivityId());
+
+        
         //create customized triggers
         Trigger openGateTrigger = new SimpleTrigger("openGateTrigger",
                                                     Scheduler.DEFAULT_GROUP, 
                                                     scheduleGate.getLessonGateOpenTime(lessonStartTime));
+        
+        
         Trigger closeGateTrigger = new SimpleTrigger("closeGateTrigger",
                                                     Scheduler.DEFAULT_GROUP,
                                                     scheduleGate.getLessonGateCloseTime(lessonStartTime));
+
         //start the scheduling job
         try
         {
-            scheduler.scheduleJob(openScheduleGateJob, openGateTrigger);
-            scheduler.scheduleJob(closeScheduleGateJob, closeGateTrigger);
+        	if((scheduleGate.getGateStartTimeOffset() == null && scheduleGate.getGateEndTimeOffset() == null) || 
+        	   (scheduleGate.getGateStartTimeOffset() != null && scheduleGate.getGateEndTimeOffset() == null))
+        		scheduler.scheduleJob(openScheduleGateJob, openGateTrigger);
+        	else if(openGateTrigger.getStartTime().before(closeGateTrigger.getStartTime())) {
+        		scheduler.scheduleJob(openScheduleGateJob, openGateTrigger);
+        		scheduler.scheduleJob(closeScheduleGateJob, closeGateTrigger);
+        	}
+
         }
         catch (SchedulerException e)
         {