diff --git a/src/Transaction.php b/src/Transaction.php
index 92d4fc53..a8c37bab 100644
--- a/src/Transaction.php
+++ b/src/Transaction.php
@@ -48,6 +48,9 @@ public static function start($options = array())
             $api->setCurrency($options['currency']);
         }
         if(isset($options['expireDate'])){
+            if(is_string($options['expireDate'])){
+                $options['expireDate'] = new \DateTime($options['expireDate']);
+            }
             $api->setExpireDate($options['expireDate']);
         }
 
@@ -89,10 +92,16 @@ public static function start($options = array())
         }
 
         if(isset($options['invoiceDate'])){
+            if(is_string($options['invoiceDate'])){
+                $options['invoiceDate'] = new \DateTime($options['invoiceDate']);
+            }
             $api->setInvoiceDate($options['invoiceDate']);
         }
 
         if(isset($options['deliveryDate'])){
+            if(is_string($options['deliveryDate'])){
+                $options['deliveryDate'] = new \DateTime($options['deliveryDate']);
+            }
             $api->setDeliveryDate($options['deliveryDate']);
         }
 
@@ -106,6 +115,9 @@ public static function start($options = array())
         }
         $enduser = array();
         if (isset($options['enduser'])) {
+            if(isset($options['enduser']['birthDate'])){
+                $options['enduser']['birthDate'] = new \DateTime($options['enduser']['birthDate']);
+            }
             $enduser = $options['enduser'];
         }
         if (isset($options['language'])) {