服务器使用PHP返回的UTC日期时间与实际的UTC日期时间不同

My server has timezone set to UTC. so when I do echo date_default_timezone_get (); I get UTC.

But when I do echo date("Y-m-d H:i:s"); the datetime I get is around 33-34 mins late than actual UTC date time. I checked if there was time offset by doing echo date('Z'); but that returns 0 as well. What am I doing wrong here?