- date_default_timezone_set: documentation ( source)
<?php
date_default_timezone_set('Australia/Sydney');
$value = '2010-09-08T07:05:04+0300';
$date = \DateTime::createFromFormat('Y-m-d\TH:i:sO', $value);
echo $date->getTimezone()->getName() . PHP_EOL;
print $date->format('c e') . PHP_EOL;
$date->setTimezone(new \DateTimeZone('America/Managua'));
echo $date->getTimezone()->getName() . PHP_EOL;
print $date->format('c e') . PHP_EOL;
$date->setTimezone(new \DateTimeZone('Australia/Sydney'));
echo $date->getTimezone()->getName() . PHP_EOL;
print $date->format('c e') . PHP_EOL;