- var_dump: documentation ( source)
- date_default_timezone_set: documentation ( source)
- date: documentation ( source)
- date_sunrise: documentation ( source)
<?php
date_default_timezone_set('Pacific/Auckland');
$dt = new DateTimeImmutable('2020-09-24 12:00:00', new DateTimeZone('Pacific/Auckland'));
var_dump($dt->getTimestamp());
var_dump($ts = date_sunrise($dt->getTimestamp(), SUNFUNCS_RET_TIMESTAMP, -38.6623, 178.0176));
var_dump(date('Y-m-d H:i:s', $ts));