InvalidArgumentException: The date cannot be created from a format. in Drupal\Component\Datetime\DateTimePlus::createFromFormat() (line 253 of core/lib/Drupal/Component/Datetime/DateTimePlus.php).

Thanks!

However I am not sure if the following condition is 100% correct
if (!empty($element['value']['#access']) && $element['value']['#access'] && !empty($element['value']['#value']) && !empty($element['end_value']['#value'])) {

Are we certain that $element['value']['#access'] exists in the array?
Because if it does not exist, then it should be considered as TRUE.
While in the above condition when it does not exist, it will skip the condition.

I think It could be better to first determine the access with something like
$access = isset($element['value']['#access']) ? $element['value']['#access'] : TRUE;
and then it can be checked later in the condition.

Automatically closed - issue fixed for 2 weeks with no activity.