diff --git a/kcadmin/views/category/_form.php b/kcadmin/views/category/_form.php
index 4572e31..ef30344 100644
--- a/kcadmin/views/category/_form.php
+++ b/kcadmin/views/category/_form.php
@@ -28,7 +28,7 @@ use blobt\widgets\DatetimePicker;
 
     <?= $form->field($model, 'sort_order')->textInput() ?>
 
-    <?= $form->field($model, 'created_at')->widget(DatePicker::className()) ?>
+    <?= $form->field($model, 'created_at')->widget(DatetimePicker::className()) ?>
 
 </div>
 <div class="box-footer">
diff --git a/vendor/blobt/widgets/DatetimePicker.php b/vendor/blobt/widgets/DatetimePicker.php
index b7df2d7..c0abeec 100644
--- a/vendor/blobt/widgets/DatetimePicker.php
+++ b/vendor/blobt/widgets/DatetimePicker.php
@@ -67,6 +67,7 @@ class DatetimePicker extends InputWidget {
      */
     public function run() {
         $this->initSetting();
+        echo $this->renderHiddenInput();
         echo $this->renderDatetimePickerInput();
         $this->registerAsset();
     }
@@ -132,6 +133,7 @@ SCRIPT;
 
         if ($this->hasModel()) {
             $timestamp = ArrayHelper::getValue($this->model, $this->attribute);
+            $value = date($this->format, $timestamp);
         }
 
         if (empty($timestamp) && $this->autoFill) {