Index: sources/gui/qml/dialogs/headerbar/HeaderbarSettings.qml
===================================================================
diff -u -r69c86c57349b7d4a6ba47a801ba27b1c470fade5 -r8f6ecb60abf6d47d4554cfd3019ca496d79b6f69
--- sources/gui/qml/dialogs/headerbar/HeaderbarSettings.qml	(.../HeaderbarSettings.qml)	(revision 69c86c57349b7d4a6ba47a801ba27b1c470fade5)
+++ sources/gui/qml/dialogs/headerbar/HeaderbarSettings.qml	(.../HeaderbarSettings.qml)	(revision 8f6ecb60abf6d47d4554cfd3019ca496d79b6f69)
@@ -35,6 +35,19 @@
 
             onValueChanged  : vAdjustmentAlarmVolume.doAdjustment( slider.value )
         }
+
+        BaseSwitch  { id: _darkMode
+            source          : vSettings.darkMode ? "qrc:/images/iMoon" : "qrc:/images/iSun"
+            checked         : vSettings.darkMode
+            activeColor     : Colors.switchActiveColor
+            inactiveColor   : Colors.switchInactiveColor
+            knobColor       : vSettings.darkMode ?  Colors.switchKnobActiveColor :
+                                                    Colors.switchKnobInactiveColor
+
+            onClicked: {
+                vSettings.darkMode = ! vSettings.darkMode
+            }
+        }
     }
 
     Connections { target: vAdjustmentAlarmVolume