updating table field by date

hi guys,... can anyone help please 

I'm building promotional advertising feature on a site,... 

and have a table fields: "featured_start" once the user is call the function

and "featured_end" after 30 days: 

$dba['Dba']['featured'] = 1;

$dba['Dba']['featured_start'] = date('Y-m-d H:i:s');

$after_30 = mktime(date("H"), date("i"), date("s"), date("m"), date("d")+30, date("y"));

$dba['Dba']['featured_end'] = date('Y-m-d H:i:s', $after_30); 

now I want to set $dba['Dba']['featured'] = 0; after 30 days, 

and reset "featured_start" and "featured_end" to NULL 

so the promotion can stop,... 

how can I this,...? 

thanks in advance 

chris 

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