Timezone

<?php

function get_time($zone_key){
	$tz = new DateTimeZone($zone_key);
	$data = new DateTime(date("Y-m-d H:i:s"));
	$data->setTimezone($tz);
	//$data = new DateTime(date("Y-m-d 00:00:00"),$tz);

	return $data->format("r");
}

if (!empty($_POST)){
	echo get_time($_POST["timezone"]);
}

$zones = timezone_identifiers_list();

?>

<form action="" method="post">
	<select name="timezone">
		<?php foreach ($zones as $key) { ?>
			<option value="<?=$key;?>"><?=$key;?></option>
		<?php } ?>
	</select>
	<input type="submit" value="Select" />
</form>