Change the default timezone being used for PHP DateTime Class

change-default-timezone-for-php-datetime-class.php

<?php
// This will output current time in EST
$timezone = 'EST';
$timestamp = time();
$datetime = new DateTime("now", new DateTimeZone($timezone)); //first argument "must" be a string
$datetime->setTimestamp($timestamp); //adjust the object to correct timestamp
echo '<b>Current Time: </b>' . $datetime->format('Ymd ga e'); 

echo '<br />';
 
// This will output current time + 24 hours in EST   
$timezone = 'EST';
$timestamp = time()+86400;
$datetime = new DateTime("now", new DateTimeZone($timezone)); //first argument "must" be a string
$datetime->setTimestamp($timestamp); //adjust the object to correct timestamp  
echo '<b>+24 hours:</b> ' . $datetime->format('Ymd ga e'); 
?>