- date: documentation ( source)
- strtotime: documentation ( source)
<?php
//following GMT value or offset get from api
$offsetHours = '-5 hours';
// This time i get from api
$currentValue = '1401705628';
$actualTimeStamp = strtotime($offsetHours,$currentValue);
echo strtotime($offsetHours)."===";
echo $actualTimeStamp."===";
echo date('d-M-Y h:i A',$actualTimeStamp);
$date = new DateTime('2000-01-01');
$date->add(new DateInterval('P10D'));
echo $date->format('Y-m-d') . "\n";