I have a date in 'n/j Y' format and would like to get a timestamp. The following code returns 1513109760, which is incorrect. It's a timestamp for 12/12 2017.
$date = '12/12 2016';
echo $date. ', ' .strtotime($date);
try this
$date = '12/12 2016';
$datetime = \DateTime::createFromFormat('n/j Y', $date);
$datetime->getTimestamp();