let unix_timestamp = 1605404179
// Create a new JavaScript Date object based on the timestamp
// multiplied by 1000 so that the argument is in milliseconds, not seconds.
var date = new Date(unix_timestamp * 1000);
// Hours part from the timestamp
var hours = date.getHours();
// Minutes part from the timestamp
var minutes = "0" + date.getMinutes();
// Seconds part from the timestamp
var seconds = "0" + date.getSeconds();
// Will display time in 10:30:23 format
var formattedTime = hours + ':' + minutes.substr(-2) + ':' + seconds.substr(-2);
console.log(formattedTime);

//Our date string. The format is Y-m-d H:i:s
$date = '2019-04-01 10:32:00';
//Convert it into a Unix timestamp using strtotime.
$timestamp = strtotime($date);
//Print it out.
echo $timestamp;