Unpublish date set to tv eventDate+86400 seconds (1day) Where would I start?

function InsertUnPubDate($data) {
	global $modx;
	$table_name = $modx->getFullTableName( 'site_content' );
	$fields = $data['unpub_date']);
	$modx->db->insert( $fields, $table_name);
}
$arr = $modx->getTemplateVarOutput('event_date');
$aday = 84600;
$edate = $arr[event_date];
$data = $edate + $aday;
$_POST['unpub_date'] = $data;
if (!isset($edate))
{exit();}
else {InsertUnPubDate($_POST['unpub_date'];}

$fields = $data['unpub_date']);

else {InsertUnPubDate($_POST['unpub_date'];}

<?php
require_once($Xettpath.'document.class.inc.php');

$createdby=$modx->getLoginUserID();
$rows = $this->getformfields();
$time=time();
$parent=$this->xetconfig['custom']['zeiten_parent'];
$template=$this->xetconfig['custom']['zeiten_template'];
$unpubtime=$this->xetconfig['custom']['unpublish_days']*86400;


if ($_POST['aktion']=='edit'){

//print_r($rows);
foreach ($rows as $row){
$start=xetadodb_strftime("%d-%m-%Y %H:%M:%S", $row['`Time`']);
$unpub=$row['`Time`']+$unpubtime;
$doc = new Document($row['`docid`']);
$doc->Set('parent',$parent);
//$doc->Set('content',$row['`content`']);
$doc->Set('description',$row['`description`']);
$doc->Set('template',$template);
$doc->Set('pagetitle','Sendezeit '.$start);
$doc->Set('longtitle','Sendezeit '.$start);
$doc->Set('menutitle','Sendezeit '.$start);
$doc->Set('cacheable','0');
$doc->Set('hidemenu','1');
$doc->Set('published',$row['`published`']);
$doc->Set('isfolder','0');
$doc->Set('unpub_date',$unpub);
$doc->Set('editedby',$createdby);
//$doc->Set('createdon',$time);
$doc->Set('editedon',$time);
//$doc->Set('publishedon',$createdby);
$doc->Set('tvmoderator',$row['`moderatorId`']);
$doc->Set('tvsendungstyp',$row['`category_ID`']);
$doc->Set('tvEasyEvents_Start',xetadodb_strftime("%d-%m-%Y %H:%M:%S", $row['`Time`']));
$doc->Set('tvEasyEvents_End',xetadodb_strftime("%d-%m-%Y %H:%M:%S", $row['`Timeend`']));
$doc->Save();
$parent = $doc->fields['id'];
//$output.='$docids'."['vcal_eventcal']='".$parent."';<br/>";	
}

}
?>

<?php

$eventTV = 'eventDate'; // TV name where we store the event dates
$debug = true; // show or hide vars on screen

$pre = $modx->db->config['table_prefix'];

// table names:
$tvDefTable = $pre . 'site_tmplvars'; // tv definitions (id - name)
$tvValTable = $pre . 'site_tmplvar_contentvalues'; // tv values
$contentTable = $pre . 'site_content'; // site content


// get TV id:
$dbQuery = "SELECT id as tvid FROM $tvDefTable WHERE name='$eventTV'";
$result = mysql_query($dbQuery) or die( mysql_error() );
while ($row = mysql_fetch_array($result)) {
	extract($row);
}


// get all documents using this TV:
$dbQuery = "SELECT contentid as cid, value as eventDate, UNIX_TIMESTAMP(value) as unixDate, DATE_ADD(value, INTERVAL 1 DAY) as unpubDate FROM $tvValTable WHERE tmplvarid='$tvid'";
$result = mysql_query($dbQuery) or die( mysql_error() );
while ($row = mysql_fetch_array($result)) {

	extract($row);

	$eventDocs[$cid]["raw"] = $eventDate; // value as is from TV-value (format: YYYY-MM-DD hh:mm)
	$eventDocs[$cid]["unix"] = $unixDate; // value as Unix timestamp (integer)
	$eventDocs[$cid]["unpub"] = $unpubDate; // unpublish date, TV value + 1 day

	$intID = (int) $cid;
	$url = $modx->makeUrl($intID, '', '', 'full');
	$eventDocs[$cid]["url"] = $url; // event details URL

}


// just for debugging: show array on screen
if($debug) {
	echo '<pre>';
	print_r($eventDocs);
	echo '</pre>';
}



// update unpub dates:
foreach($eventDocs as $k=>$v) {
	$docid = (int) $k;
	$unpubDateTime = $eventDocs[$k]["unpub"];
	$dbQuery = "UPDATE $contentTable SET unpub_date=UNIX_TIMESTAMP('$unpubDateTime') WHERE id=$docid";
	$result = mysql_query($dbQuery) or die( mysql_error() );
}

?>