print $query->header(-type=>'image/gif',
                        -status=>'402 Payment Required',
                        -expires=>'+3d',
                        -cookie=>$my_cookie,
                        -charset=>'UTF-7',
                        -Cost=>'$0.02');

##</code><code>##

        +30s                              30 seconds from now
        +10m                              ten minutes from now
        +1h                               one hour from now
        -1d                               yesterday (i.e. "ASAP!")
        now                               immediately
        +3M                               in three months
        +10y                              in ten years time
        Thu, 25-Apr-1999 00:40:33 GMT     at the indicated time & date