EE3 display custom timezone using a hook

ee3_timezone_hook.php

<?php
//* Please do NOT include the opening php tag, except of course if you're starting with a blank file

function my_ee_timezone_output($event_id) {
	global $wpdb;
    $tz_event = $wpdb->get_var($wpdb->prepare("SELECT timezone_string FROM " . EVENTS_DETAIL_TABLE . " WHERE id = '%d'", $event_id));
    if(! isset($tz_event)) {
    	return;
    }
    date_default_timezone_set($tz_event);
    $html = '<p class="event_time">';
    $html .= '<span class="span_event_time_label">&nbsp;</span><span class="span_event_time_value">';
    $html .= '(All times are ' . date('T') . ')</span></p>';
    date_default_timezone_set('UTC');
    echo $html;
} 
add_action('espresso_price_select', 'my_ee_timezone_output', 99, 3);