How to Change Date and Time Notations in WordPress?

/* Listing Business hours to 24hr timepicker. */
function wpsc_gd_snippet_listings_times_24hr( $params ) {
	$params['time_24hr'] = true;
	return $params;
}
add_filter( 'ayecode_ui_calendar_params', 'wpsc_gd_snippet_listings_times_24hr', 11, 1 );