background.md

• Mac OS X 10.7.4
• PHP 5.3.8 (system-supplied)

gistfile1.txt

> php
<?php

$startDate = new DateTime('@100');
$endDate = new DateTime('@200');

$oneSecondInterval = new DateInterval('PT1S');

echo "Start date, @100: " . dt_format($startDate) . "\n";
echo "End date, @200: " . dt_format($endDate). "\n";
echo "\n";

$startDate->add($oneSecondInterval);
echo "New Start Date, @100 + PT1S: " . dt_format($startDate) . "\n";

function dt_format(DateTime $dt)
{
    return $dt->format('r') . " - " . $dt->getTimestamp();
}
Start date, @100: Thu, 01 Jan 1970 00:01:40 +0000 - 100
End date, @200: Thu, 01 Jan 1970 00:03:20 +0000 - 200

New Start Date, @100 + PT1S: Thu, 01 Jan 1970 01:01:41 +0000 - 3701