Custom date format for output when using WP Job Manager Field Editor (example uses job_expires meta key)

functions.php

<?php
// ^ the <?php above should only be in your functions.php file ONCE, at the top

// The filter is field_editor_output_as_value_METAKEY
// where you need to replace METAKEY with the actual meta key you want to filter the output for
// .... as you can see below you can also add multiple filters using the same function.
//add_filter( 'field_editor_output_as_value_METAKEY', 'my_custom_format_value_as_date_format' );
//add_filter( 'field_editor_output_as_value_ANOTHERMETAKEY', 'my_custom_format_value_as_date_format' );

// This example is used for the "job_expires" meta key
add_filter( 'field_editor_output_as_value_job_expires', 'my_custom_format_value_as_date_format' );
/**
 * General function to output HTML for custom fields
 *
 * @author             Myles McNamara
 * @url                https://plugins.smyl.es
 *
 * @param    $value    The value before it is output on the listing
 */
function my_custom_format_value_as_date_format( $value ){
	if( empty( $value ) ) return $value;
	
	// Convert to epoch from any type of date format
	$timestamp = strtotime( $value );
	
	// See http://php.net/manual/en/function.date.php for available formats
    $formatted_date = date_i18n( "j F Y", $timestamp );
	
	return $formatted_date;
}