<?php
$start_time = get_field('start_time');
$end_time = get_field('end_time');
if ( !empty($start_time) ) { echo '<div class="entry-meta start-time"><span>' . $start_time . ' </span></div>' ;}
if ( !empty($end_time) ) { echo '<div class="entry-meta end-time"><span>- ' . $end_time . '</span></div>' ;}
?>