$utc='2019-1-18T00:00:00Z';

$time= str_replace(array('T','Z'),' ',$utc);

$unix=strtotime($time);

echo $unix;

//输出:1547740800

5、标准时间转UNIX时间戳

$time='2019-1-18 00:00:00';

$unix=strtotime($time);

echo $unix;

//输出:1547740800

6、标准时间转UTC时间

$time='2019-1-18 00:00:00';

$unix=strtotime($time);

$utc=date('Y-m-dTH:i:sZ', $unix);

echo $utc;

//输出:2019-1-18T00:00:00Z