- strtotime: documentation ( source)
<?php
$date = new \DateTime('2000-03-12 08:30:00');
$fmt = new IntlDateFormatter(
'en_US',
IntlDateFormatter::FULL,
IntlDateFormatter::MEDIUM,
'America/New_York'
);
$dropOffDateTime = \DateTime::createFromFormat(
'U',
strtotime(
$fmt->format($date)
)
);
echo $dropOffDateTime->getTimestamp();