Symfony throws TransformationFailedException only on one specific datetime form value [требует правки]

have a formType with date field $builder->add('passportDate', 'date', array( 'widget' => 'single_text', 'format' => 'yyyy-MM-dd', 'error_bubbling' => true, 'required' => true, 'label' => 'Date given' )); When submitting form, everything works just fine, except one value - 15.04.2009, which causes TransformationFailedException in Form class when sending submit, so every time I do this I get 'false' on $form-isValid() check. Maybe anybody have some suggestions? Every other value works just fine. And i'm pretty sure that nothing modifies data. Symfony version is 2.3.6