Index: lams_admin/conf/language/lams/ApplicationResources.properties
===================================================================
diff -u -raaca705a11ef49c4f5eacfff51ac07510fbac65b -rb6c65c755217e6099fb5a3769a1ac049d9fcfaf3
--- lams_admin/conf/language/lams/ApplicationResources.properties	(.../ApplicationResources.properties)	(revision aaca705a11ef49c4f5eacfff51ac07510fbac65b)
+++ lams_admin/conf/language/lams/ApplicationResources.properties	(.../ApplicationResources.properties)	(revision b6c65c755217e6099fb5a3769a1ac049d9fcfaf3)
@@ -530,6 +530,6 @@
 config.failed.attempts  =Number of failed logins before locking account
 config.lock.out.time  =Number of minutes to lock account for
 config.default.html.theme  =Default theme
+config.show.timezone.warning  =Show warning when user's LAMS timezone does not match their computer/device.
 
-
 #======= End labels: Exported 524 labels for en AU =====
Index: lams_central/src/java/org/lamsfoundation/lams/web/IndexAction.java
===================================================================
diff -u -rfebc5ec394566f98439ce776a0be320b34310b0a -rb6c65c755217e6099fb5a3769a1ac049d9fcfaf3
--- lams_central/src/java/org/lamsfoundation/lams/web/IndexAction.java	(.../IndexAction.java)	(revision febc5ec394566f98439ce776a0be320b34310b0a)
+++ lams_central/src/java/org/lamsfoundation/lams/web/IndexAction.java	(.../IndexAction.java)	(revision b6c65c755217e6099fb5a3769a1ac049d9fcfaf3)
@@ -123,6 +123,18 @@
 	    request.setAttribute("lamsCommunityEnabled", reg.isEnableLamsCommunityIntegration());
 	}
 	
+	// only show the growl warning the first time after a user has logged in & if turned on in configuration
+	Boolean tzWarning = Configuration.getAsBoolean(ConfigurationKeys.SHOW_TIMEZONE_WARNING);
+	request.setAttribute("showTimezoneWarning", tzWarning);
+	request.setAttribute("showTimezoneWarningPopup", false);
+	if ( tzWarning ) {
+	    Boolean ssWarningShown = (Boolean) ss.getAttribute("timezoneWarningShown");
+	    if ( ! Boolean.TRUE.equals(ssWarningShown) ) {
+		ss.setAttribute("timezoneWarningShown", Boolean.TRUE);
+		request.setAttribute("showTimezoneWarningPopup", true);
+	    }
+	}
+    	    
 	List<Organisation> favoriteOrganisations = userManagementService.getFavoriteOrganisationsByUser(userDTO.getUserID());
 	request.setAttribute("favoriteOrganisations", favoriteOrganisations);
 	request.setAttribute("activeOrgId", user.getLastVisitedOrganisationId());
Index: lams_central/web/main.jsp
===================================================================
diff -u -r2079d168be1ddba5613804efe9f03b2b87a9b260 -rb6c65c755217e6099fb5a3769a1ac049d9fcfaf3
--- lams_central/web/main.jsp	(.../main.jsp)	(revision 2079d168be1ddba5613804efe9f03b2b87a9b260)
+++ lams_central/web/main.jsp	(.../main.jsp)	(revision b6c65c755217e6099fb5a3769a1ac049d9fcfaf3)
@@ -26,6 +26,7 @@
 	<script type="text/javascript" src="includes/javascript/openUrls.js"></script>
 	<script type="text/javascript" src="includes/javascript/jquery.js"></script>
 	<script type="text/javascript" src="includes/javascript/jquery-ui.js"></script>
+	<script type="text/javascript" src="includes/javascript/jquery.blockUI.js"></script>
 	<script type="text/javascript" src="includes/javascript/jquery.tablesorter.js"></script>
 	<script type="text/javascript" src="includes/javascript/jquery.tablesorter-pager.js"></script>
 	<script type="text/javascript" src="includes/javascript/jquery.tablesorter-widgets.js"></script> 	
@@ -98,13 +99,33 @@
 				}
 			</c:if>
 
+			<c:if test="${showTimezoneWarning}"> 
 		    var current_date = new Date( );
 		    var client_gmt_offset_minutes = current_date.getTimezoneOffset( );
 		    $('#offset').html( client_gmt_offset_minutes / 60 );
 		    var lams_gmt_offset_minutes = ( <lams:user property="timeZone.rawOffset"/> + <lams:user property="timeZone.DSTSavings"/> ) / 60000;
 		    if ( client_gmt_offset_minutes != -lams_gmt_offset_minutes ) {
 			    $('#timezoneWarning').html( '<BR/><fmt:message key="label.timezone.warning"/>');
-			}			
+				<c:if test="${showTimezoneWarningPopup}"> 
+	 			    $.blockUI({ 
+			            message: '<div class="growlUI"><h2><fmt:message key="label.timezone.warning"/></h2></div>', 
+	 		            fadeIn: 700, 
+			            fadeOut: 700, 
+			            width: 500,
+			            timeout: 8000, 
+			            showOverlay: false, 
+			            centerY: false, 
+			            css: { 
+			                backgroundColor: '#000', 
+			                '-webkit-border-radius': '10px', 
+			                '-moz-border-radius': '10px', 
+			                opacity: .6, 
+			                color: '#fff' 
+			            } 
+			        }); 
+	 			</c:if>
+  		    } 
+		    </c:if>
 		});
 	</script>
 </lams:head>
Index: lams_common/src/java/org/lamsfoundation/lams/dbupdates/patch2040082.sql
===================================================================
diff -u
--- lams_common/src/java/org/lamsfoundation/lams/dbupdates/patch2040082.sql	(revision 0)
+++ lams_common/src/java/org/lamsfoundation/lams/dbupdates/patch2040082.sql	(revision b6c65c755217e6099fb5a3769a1ac049d9fcfaf3)
@@ -0,0 +1,10 @@
+SET AUTOCOMMIT = 0;
+set FOREIGN_KEY_CHECKS = 0;
+ 
+--  LDEV-4144 Timezone warning
+insert into lams_configuration (config_key, config_value, description_key, header_name, format, required)
+values ('ShowTimezoneWarning','true', 'config.show.timezone.warning', 'config.header.features', 'BOOLEAN', 1);
+
+COMMIT;
+SET AUTOCOMMIT = 1;
+set FOREIGN_KEY_CHECKS = 1;
\ No newline at end of file
Index: lams_common/src/java/org/lamsfoundation/lams/util/ConfigurationKeys.java
===================================================================
diff -u -r2bd42e9a3a1774b3d51a0295f55f7184273848af -rb6c65c755217e6099fb5a3769a1ac049d9fcfaf3
--- lams_common/src/java/org/lamsfoundation/lams/util/ConfigurationKeys.java	(.../ConfigurationKeys.java)	(revision 2bd42e9a3a1774b3d51a0295f55f7184273848af)
+++ lams_common/src/java/org/lamsfoundation/lams/util/ConfigurationKeys.java	(.../ConfigurationKeys.java)	(revision b6c65c755217e6099fb5a3769a1ac049d9fcfaf3)
@@ -282,4 +282,7 @@
     
     public static String LOCK_OUT_TIME = "LockOutTime";
 
+    // LDEV-4144
+    public static String SHOW_TIMEZONE_WARNING = "ShowTimezoneWarning";
+
 }