Changes the datetime format used for the datetime picker inside the event editor.

change_event_editor_datetime_format.php

<?php
/**
 * Changes the datetime format used for the datetime picker inside the event editor.
 *
 * @param   array   $defaults	  The current defaults.
 */
function change_event_editor_datetime_format( $defaults ) {
  
  $defaults[ 'datetime_format' ] = 'Y-m-d h:i A';
  
  return $defaults;
  
}
add_filter( 'wpt/event_editor/defaults', 'change_event_editor_datetime_format', 10, 1 );