PHP DateTime microseconds always returns 0

Question

this code always returns 0 in PHP 5.2.5 for microseconds:

<?php
$dt = new DateTime();
echo $dt->format("Y-m-dTH:i:s.u") . "
";
?>

Output:

[root@www1 ~]$ php date_test.php
2008-10-03T20:31:26.000000
[root@www1 ~]$ php date_test.php
2008-10-03T20:31:27.000000
[root@www1 ~]$ php date_test.php
2008-10-03T20:31:27.000000
[root@www1 ~]$ php date_test.php
2008-10-03T20:31:28.000000

Any ideas?

Answer 1

This seems to work, although it seems illogical that http://us.php.net/date documents the microsecond specifier yet doesn't really support it:

function getTimestamp()
{
        return date("Y-m-dTH:i:s") . substr((string)microtime(), 1, 8);
}