patch for non-standard date formats with php >= 5.3

gistfile1.txt

function espresso_ical_prepare_by_meta($meta, $title = '', $image = '', $link_only = FALSE) {
	global $org_options, $wpdb;
	do_action('action_hook_espresso_log', __FILE__, __FUNCTION__, '');
	if ( !empty($org_options['display_ical_download']) && $org_options['display_ical_download'] == 'N' || !isset($org_options['display_ical_download']) ){
		return;
}
	$start_date_object = DateTime::createFromFormat(get_option('date_format').' G:i', $meta['start_date'] . ' ' . $meta['start_time']);
	$start_date = !empty($start_date_object) ? $start_date_object->getTimestamp() : '';
	$end_date_object = DateTime::createFromFormat(get_option('date_format').' G:i', $meta['end_date'] . ' ' . $meta['end_time']);
	$end_date = !empty($end_date_object) ? $end_date_object->getTimestamp() : '';
	$title = empty($text) ? __('iCal Import', 'event_espresso') : $title;
	$image = empty($image) ? '<img src="'.EVENT_ESPRESSO_PLUGINFULLURL . 'images/icons/calendar_link.png">' : $image;
	if ($link_only == TRUE){
		$image = $title;
	}
	$array = array(
		'iCal' => 'true', 
		'currentyear' => date('Y'),
		'currentmonth' => date('m'),
		'currentday' => date('d'),
		'currenttime' => date('His'),
		'event_id' => $meta['event_id'],
		'registration_id' => !empty($meta['registration_id']) ? $meta['registration_id'] : $_SESSION['espresso_session']['id'],
		'contact_email' => $meta['contact_email'],
		'startyear' => date('Y', $start_date),
		'startmonth' => date('m', $start_date),
		'startday' => date('d', $start_date),
		'starttime' => date('His', $start_date),
		'endyear' => date('Y', $end_date),
		'endmonth' => date('m', $end_date),
		'endday' => date('d', $end_date),
		'endtime' => date('His', $end_date),
		'event_summary' => stripslashes($meta['event_name']),
		//'event_description' => espresso_format_content(stripslashes($meta['event_desc'])),
		'eereg_url' => espresso_reg_url($meta['event_id']),
		'site_url' => site_url(),
		'organization' => $org_options['organization'],
		'location' => str_replace(array('<br>','<br />'), ' ', $meta['location']),
	);
	$url = add_query_arg( $array, site_url() );
	$html = '<a  href="' . wp_kses($url, '') . '" id="espresso_ical_' . $meta['event_id'] . '" class="espresso_ical_link" title="' . $title . '">' . $image . '</a>';
	return $html;
}