diff --git a/api/js/framework/fw_base.js b/api/js/framework/fw_base.js
index d603fb2f07..cea5a6c83a 100644
--- a/api/js/framework/fw_base.js
+++ b/api/js/framework/fw_base.js
@@ -857,12 +857,16 @@ var fw_base = (function(){ "use strict"; return Class.extend(
 	tzSelection: function(_tz)
 	{
 		//Perform an AJAX request to tell server
-		var req = egw.json('EGroupware\Api\Framework\Ajax::ajax_tz_selection',[_tz],null,null,false); // false = synchron
+		var req = egw.json('EGroupware\\Api\\Framework\\Ajax::ajax_tz_selection',[_tz],null,null,false); // false = synchron
 		req.sendRequest();
 
-		if (this.activeApp.browser)
+		// Reload apps so they can use the new setting
+		for (var app in this.applications)
 		{
-			this.activeApp.browser.reload();
+			if (this.applications[app].browser)
+			{
+				this.applications[app].browser.reload();
+			}
 		}
 	},
 
diff --git a/api/src/Egw.php b/api/src/Egw.php
index 3c91308ff3..bfbb4fb689 100644
--- a/api/src/Egw.php
+++ b/api/src/Egw.php
@@ -234,8 +234,6 @@ class Egw extends Egw\Base
 		// init the translation class, necessary as own wakeup would run before our's
 		Translation::init(isset($GLOBALS['egw_info']['flags']['load_translations']) ? $GLOBALS['egw_info']['flags']['load_translations'] : true);
 
-		$this->unset_datetime();
-
 		// verify the session
 		$GLOBALS['egw']->verify_session();
 		$GLOBALS['egw']->check_app_rights();
@@ -243,14 +241,6 @@ class Egw extends Egw\Base
 		$this->load_optional_classes();
 	}
 
-	/**
-	 * Unsetting datetime object, so time gets updated
-	 */
-	function unset_datetime()
-	{
-		unset($this->datetime);
-	}
-
 	/**
 	 * load optional classes by mentioning them in egw_info[flags][enable_CLASS_class] => true
 	 *
diff --git a/api/src/Preferences.php b/api/src/Preferences.php
index 81585d556f..ecc6fe2e06 100644
--- a/api/src/Preferences.php
+++ b/api/src/Preferences.php
@@ -521,20 +521,13 @@ class Preferences
 	 */
 	function check_set_tz_offset()
 	{
-		$prefs =& $GLOBALS['egw_info']['user']['preferences']['common'];
+		$prefs =& $this->data['common'];
 
 		if (!empty($prefs['tz']))
 		{
 			DateTime::setUserPrefs($prefs['tz'],$prefs['dateformat'],$prefs['timeformat']);
 			// set the old preference for compatibilty with old code
 			$prefs['tz_offset'] = DateTime::tz_offset_s()/3600;
-			//echo "<p>".__METHOD__."() tz=$prefs[tz] --> tz_offset=$prefs[tz_offset]</p>\n";
-
-			// ToDo: get rid of that
-			if (isset($GLOBALS['egw']) && ($GLOBALS['egw'] instanceof egw))
-			{
-				$GLOBALS['egw']->unset_datetime();	// to force an update
-			}
 		}
 	}