- var_dump: documentation ( source)
- ini_set: documentation ( source)
- date: documentation ( source)
<?php
ini_set('date.timezone', 'America/Los_Angeles');
$nowTime = new \DateTime('now', new DateTimeZone('America/New_York'));
$programTime = new \DateTime(date('Y-m-d') . " 06:00", new DateTimeZone('America/New_York'));
$lengthSeconds = 75 * 60;
$endTime = $programTime->getTimestamp() + $lengthSeconds;
$endDate = $programTime->add(new \DateInterval('PT' . $lengthSeconds . 'S'));
$diff = $endDate->getTimestamp() - $nowTime->getTimestamp();
var_dump($diff, $endDate->format('d-m-y H:i'), $nowTime->format('d-m-y H:i'), $endDate->getTimestamp(), $nowTime->getTimestamp());