- date: documentation ( source)
<?php
$DateTime = new \DateTime('2018-5-30');
$formatter = new IntlDateFormatter('en-US', IntlDateFormatter::SHORT, IntlDateFormatter::NONE, 'Europe/Berlin');
$timestamp = $formatter->parse('3/9/18');
echo $timestamp . "\r\n";
echo date('Y-m-d H:i:s', $timestamp) . "\r\n";
echo date('Y-m-d', $timestamp) . "\r\n";