fdob

<?php

$content = $this->api->getContentToUpdate(
    $this->api->getContentInfoByPath( '/Date-and-Time-Test-Object' )
);

try {
    $newData = new DateTime( '31-09-2012 12:00 am' ); // 31-09-2012 12:00 am

    $content->setField( 'date_time', $newData );