diff --git a/vendor/blobt/widgets/DatePicker.php b/vendor/blobt/widgets/DatePicker.php
index 2014fb7..b3b7c99 100644
--- a/vendor/blobt/widgets/DatePicker.php
+++ b/vendor/blobt/widgets/DatePicker.php
@@ -133,7 +133,9 @@ SCRIPT;
 
         if ($this->hasModel()) {
             $timestamp = ArrayHelper::getValue($this->model, $this->attribute);
-            $value = date($this->format, $timestamp);
+            if (!empty($timestamp)) {
+                $value = date($this->format, $timestamp);
+            }
         }
 
         if (empty($timestamp) && $this->autoFill) {
diff --git a/vendor/blobt/widgets/DatetimePicker.php b/vendor/blobt/widgets/DatetimePicker.php
index c0abeec..a2e8379 100644
--- a/vendor/blobt/widgets/DatetimePicker.php
+++ b/vendor/blobt/widgets/DatetimePicker.php
@@ -133,7 +133,9 @@ SCRIPT;
 
         if ($this->hasModel()) {
             $timestamp = ArrayHelper::getValue($this->model, $this->attribute);
-            $value = date($this->format, $timestamp);
+            if (!empty($timestamp)) {
+                $value = date($this->format, $timestamp);
+            }
         }
 
         if (empty($timestamp) && $this->autoFill) {