report_candidates_partial.html.php

// Format the date field, leaving invalid dates alone
if ($candidate->dob != null) {
  // Check if the entered date is valid
  if (strtotime($candidate->dob)) {
    $candidate->dob = date("d/m/Y", strtotime($candidate->dob));
  }
} else {
  $candidate->dob = "some new placeholder";
}