Unix timestamps aren’t exactly human readable representations of time. After all, a Unix timestamp is the current time measured in the number of seconds since the Unix Epoch (January 1 1970 00:00:00 GMT).
Usually one wants to show this to a user in a much friendlier date time format, like the tried and trusted Y-m-d H:i:s standard, e.g. ‘2015-03-23 09:00’.
It turns out achieving this formatted display is relatively easy: just use the standard DateTime class!
You can use a timestamp as construct parameter if you add the @-sign at the front. Once that is done, simply use the format function to return a user friendly date/time string:
$dateTimeEnd = new DateTime('@1427105451');
echo $dateTimeEnd->format('Y-m-d H:i:s'); //prints 2015-03-23 10:10:51
Quick and simple.
Related Link: http://php.net/manual/en/class.datetime.php