diff --git a/type/ILB_Sem_tutoria_2014/certificate.php b/type/ILB_Sem_tutoria_2014/certificate.php
index fe0beb8..610739f 100644
--- a/type/ILB_Sem_tutoria_2014/certificate.php
+++ b/type/ILB_Sem_tutoria_2014/certificate.php
@@ -34,9 +34,13 @@ if (!defined('MOODLE_INTERNAL')) {
  * Finally format them to print
  */
 require_once("$CFG->dirroot/completion/completion_completion.php");
+require_once("$CFG->dirroot/enrol/locallib.php");
 $cc = new completion_completion(array('userid'=>$USER->id, 'course'=>$course->id));
 
-$start_date = $cc->timeenrolled;
+$enrol_manager = new course_enrolment_manager($PAGE, $course);
+$user_enrol = end($enrol_manager->get_user_enrolments($USER->id));
+
+$start_date = $user_enrol->timestart;
 $end_date   = $cc->timecompleted;
 
 $fmt = '%d/%m/%Y'; // Default format