- date: documentation ( source)
- strtotime: documentation ( source)
<?php
$datestart = "2012-03-06";
$datenow = date("$datestart H:i:s", current_time( 'timestamp' ));
$newpostdate1 = $datenow + strtotime("0 years 0 months 1 days 0 hours 0 minutes 0 seconds");
$newpostdate = date("Y-m-d H:i:s", $newpostdate1);
echo $datenow . " " . $newpostdate;