render date-field programmatically

gistfile1.php

<?php
$date_field = $node->field_date_event;
// array for configurtion
$display_settings = array (
  'type' => 'date_default', // type of the date field
  'settings' => array (
    'format_type' => 'event' // custom date format
   )
);
    
$date_formatted = field_view_value('node',$node, 'field_date_event', $date_field['und'][0], $display_settings);
// show formatted string
echo $date_formatted['#markup'];