Save Date?

How can i save a date created plus 31 days?

 

I have

$expires = date("Y-m-d H:i:s");
$expires = strtotime(date("Y-m-d H:i:s", strtotime($expires)) . " +31 days");
$this->Post->id = $id;

$this->Post->saveField('expires', '$expires');

 

DB is always 0000-00-00 00:00:00

field in db is expires, Datetime

 

Thanks

 

D

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