diff --git a/src/Models/IranPaymentTransaction.php b/src/Models/IranPaymentTransaction.php
index f95daf8..2404f95 100644
--- a/src/Models/IranPaymentTransaction.php
+++ b/src/Models/IranPaymentTransaction.php
@@ -2,6 +2,7 @@
 
 namespace Dena\IranPayment\Models;
 
+use DateTimeInterface;
 use Illuminate\Database\Eloquent\Model;
 
 use Dena\IranPayment\Traits\IranPaymentDatabase as DatabaseTrait;
@@ -34,6 +35,17 @@ class IranPaymentTransaction extends Model
     const T_PAID_BACK = 5;
     const T_CANCELED = 6;
 
+    /**
+     * Prepare a date for array / JSON serialization.
+     *
+     * @param  \DateTimeInterface  $date
+     * @return string
+     */
+    protected function serializeDate(DateTimeInterface $date)
+    {
+        return $date->format('Y-m-d H:i:s');
+    }
+
     /**
      * The attributes that are mass assignable.
      *