I'm using an API right now and it provides an epochTime. I've tried everything to convert this epochtime to date, but it doesn't seem to be working including
$epoch_time / 1000
Fixed it using substr($epoch, 0, 10) and then used the date function for anyone wondering about the 13 digit epoch times.
Here is a sample code:
echo date("Y-m-d H:i:s", substr("1477020641000", 0, 10)); // Result: 2016-10-20 20:30:41