diff --git a/api/js/etemplate/Et2Date/Et2DateDuration.ts b/api/js/etemplate/Et2Date/Et2DateDuration.ts
index 9d97b536f5..0bdc822e39 100644
--- a/api/js/etemplate/Et2Date/Et2DateDuration.ts
+++ b/api/js/etemplate/Et2Date/Et2DateDuration.ts
@@ -359,7 +359,7 @@ export class Et2DateDuration extends Et2InputWidget(FormControlMixin(LitElement)
 
 	set value(_value)
 	{
-		this._display = this._convert_to_display(_value == "" ? 0 : parseFloat(_value));
+		this._display = this._convert_to_display(this.emptyNot0 && ""+_value === "" ? '' : parseFloat(_value));
 		this.requestUpdate();
 	}
 
diff --git a/api/src/Preferences.php b/api/src/Preferences.php
index b8752e08a9..93b31c2fd0 100644
--- a/api/src/Preferences.php
+++ b/api/src/Preferences.php
@@ -891,7 +891,7 @@ class Preferences
 			foreach($prefs as $app => $value)
 			{
 				// check if app preferences have changed, if not no need to save them
-				if ($old_prefs && $old_prefs[$app] == $value) continue;
+				if ($old_prefs && !array_diff_assoc($old_prefs[$app], $value)) continue;
 
 				if (!$changed++) $this->db->transaction_begin();
 
@@ -1051,4 +1051,4 @@ class Preferences
 		}
 		return $all_settings;
 	}
-}
+}
\ No newline at end of file
diff --git a/preferences/inc/class.preferences_settings.inc.php b/preferences/inc/class.preferences_settings.inc.php
index 49705e5c92..704352d7e6 100644
--- a/preferences/inc/class.preferences_settings.inc.php
+++ b/preferences/inc/class.preferences_settings.inc.php
@@ -401,6 +401,11 @@ class preferences_settings
 			{
 				Egw::invalidate_session_cache();
 			}
+			// update $GLOBALS['egw_info']['user']['preferences'] as some hooks called use that can return or set old values (e.g. calendar default-alarm(-wholeday))
+			if ($type === 'user' && $GLOBALS['egw']->preferences->get_account_id() == $GLOBALS['egw_info']['user']['account_id'])
+			{
+				$GLOBALS['egw_info']['user']['preferences'] = $GLOBALS['egw']->preferences->data;
+			}
 		}
 
 		return null;