diff --git a/api/v3/TwingleDonation/Cancel.php b/api/v3/TwingleDonation/Cancel.php
index 70d7747..7a8c5fc 100644
--- a/api/v3/TwingleDonation/Cancel.php
+++ b/api/v3/TwingleDonation/Cancel.php
@@ -72,7 +72,7 @@ function civicrm_api3_twingle_donation_Cancel($params) {
 
   try {
     // Validate date for parameter "cancelled_at".
-    if (!DateTime::createFromFormat('Ymd', $params['cancelled_at'])) {
+    if (!DateTime::createFromFormat('YmdHis', $params['cancelled_at'])) {
       throw new CiviCRM_API3_Exception(
         E::ts('Invalid date for parameter "cancelled_at".'),
         'invalid_format'
diff --git a/api/v3/TwingleDonation/Endrecurring.php b/api/v3/TwingleDonation/Endrecurring.php
index 4766359..eced12e 100644
--- a/api/v3/TwingleDonation/Endrecurring.php
+++ b/api/v3/TwingleDonation/Endrecurring.php
@@ -65,7 +65,7 @@ function civicrm_api3_twingle_donation_endrecurring($params) {
 
   try {
     // Validate date for parameter "ended_at".
-    if (!DateTime::createFromFormat('Ymd', $params['ended_at'])) {
+    if (!DateTime::createFromFormat('YmdHis', $params['ended_at'])) {
       throw new CiviCRM_API3_Exception(
         E::ts('Invalid date for parameter "ended_at".'),
         'invalid_format'