let result = parseInt('#cef1ff'.substr(1), 16) - parseInt('#110011'.substr(1), 16);
console.log('#' + result.toString(16).padStart(6, '0'));
sudo systemctl restart linuxbox.service
? $date1 = new DateTime("2018-12-16 23:55:00");
$date2 = new DateTime("2018-12-17 00:09:00");
$interval = $date1->diff($date2);
print_r($interval);