Change clock format

config/xfce4/xfconf/xfce-perchannel-xml/xfce4-panel.xml

@@ -51,7 +51,9 @@
       <property name="enable-keyboard-shortcuts" type="bool" value="true"/>
     </property>  
     <property name="plugin-7" type="string" value="battery"/>
-    <property name="plugin-8" type="string" value="clock"/>
+    <property name="plugin-8" type="string" value="clock">
+      <property name="digital-format" type="string" value="%_H:%M"/>
+    </property>
     <property name="plugin-10" type="string" value="showdesktop"/>
     <property name="plugin-11" type="string" value="separator"/>
     <property name="plugin-12" type="string" value="launcher">