diff --git a/lib/zin/wg/gantt/js/v1.js b/lib/zin/wg/gantt/js/v1.js
index 1ae73b5c38..3167740a43 100644
--- a/lib/zin/wg/gantt/js/v1.js
+++ b/lib/zin/wg/gantt/js/v1.js
@@ -403,7 +403,7 @@ function initGantt()
     gantt.config.details_on_create   = false;
     gantt.config.duration_unit       = "day";
     setScalesByZoom(zooming);
-    if(!showChart) gantt.config.show_chart = false;
+    gantt.config.show_chart = showChart;
 
     gantt.config.columns = [];
     gantt.config.columns.push({name: 'text', width: '*', tree: true, resize: true, min_width:120, width:200});
diff --git a/module/programplan/ui/gantt.html.php b/module/programplan/ui/gantt.html.php
index 63ee56fdbc..859543a84b 100644
--- a/module/programplan/ui/gantt.html.php
+++ b/module/programplan/ui/gantt.html.php
@@ -65,5 +65,6 @@ gantt
     set('canEdit', common::hasPriv('programplan', 'ganttEdit')),
     set('canEditDeadline', common::hasPriv('review', 'edit')),
     set('zooming', isset($zooming) ? $zooming : 'day'),
+    set('showChart', !$dateDetails),
     set('options', $plans)
 );
diff --git a/module/programplan/zen.php b/module/programplan/zen.php
index d7f6659832..c677f9a235 100644
--- a/module/programplan/zen.php
+++ b/module/programplan/zen.php
@@ -366,7 +366,7 @@ class programplanZen extends programplan
         $module = 'programplan';
         if(!isset($this->config->programplan->browse->stageCustom)) $this->loadModel('setting')->setItem("$owner.$module.browse.stageCustom", 'date,task,point');
         $selectCustom = $this->loadModel('setting')->getItem("owner={$owner}&module=programplan&section=browse&key=stageCustom");
-        $dateDetails  = strpos($selectCustom, 'date') !== false ? 0 : 1; // Gantt chart detail date display.
+        $dateDetails  = strpos($selectCustom, 'date') !== false ? false : true; // Gantt chart detail date display.
 
         foreach(explode(',', $this->config->programplan->custom->customGanttFields) as $field) $customFields[$field] = $this->lang->programplan->ganttCustom[$field];
         $this->view->customFields = $customFields;