- assert: documentation ( source)
- var_dump: documentation ( source)
<?php
$start = new \DateTime('2015-08-31 00:00:00.000001');
$end = new \DateTime('2015-09-01 00:00:00.000000');
$diff = $start->diff($end);
var_dump($diff);
assert($diff->days === 0);
assert($diff->d === 0);
assert($diff->f === 1.0E-6);