diff --git a/kstars/tools/planetviewer.ui b/kstars/tools/planetviewer.ui
--- a/kstars/tools/planetviewer.ui
+++ b/kstars/tools/planetviewer.ui
@@ -79,7 +79,11 @@
       </spacer>
      </item>
      <item>
-      <widget class="QDateEdit" name="DateBox" />
+      <widget class="QDateEdit" name="DateBox">
+       <property name="displayFormat">
+        <string>M/d/yyyy</string>
+       </property>
+      </widget>
      </item>
      <item>
       <widget class="QPushButton" name="TodayButton" >