diff --git a/org.eclipse.scout.rt.client/src/main/java/org/eclipse/scout/rt/client/ui/basic/table/columns/AbstractTimeColumn.java b/org.eclipse.scout.rt.client/src/main/java/org/eclipse/scout/rt/client/ui/basic/table/columns/AbstractTimeColumn.java
index aed3905..971ff98 100644
--- a/org.eclipse.scout.rt.client/src/main/java/org/eclipse/scout/rt/client/ui/basic/table/columns/AbstractTimeColumn.java
+++ b/org.eclipse.scout.rt.client/src/main/java/org/eclipse/scout/rt/client/ui/basic/table/columns/AbstractTimeColumn.java
@@ -36,4 +36,9 @@
     return true;
   }
 
+  @Override
+  protected String getConfiguredGroupFormat() {
+    return "HH";
+  }
+
 }