使用DateTime :: createFromFormat格式化字符串，以微秒为单位

I have the following date from influxdb: 2015-07-23T20:15:12.630199712Z

I am trying to format it to just show the hours, minutes and seconds.

$date = \DateTime::createFromFormat("Y-m-d\TH:i:s.u\Z", '2015-07-23T20:15:12.630199712Z');
if($date  === false) {
    die('yes');
}

Logically that should work... but it returns false. I have tried about ten other different combinations but alas, none of them worked. Any ideas? Thanks.