date plus 7 more days

Hi all I have variable that store date like this : $First = "$year" . "$month" . "$date"; ( which return 20010201 for Feb 1,2001) . I wanna do the loop 8 times that will add 7 more days to the begining date and keep adding it for 8 times. The looping thing is okay but I am not sure if I simply plus 7 on top of date value will give me the date value I want to have. Is this sniplet below okay? ************** $First = "$year" . "$month" . "$date"; for ($i=1; $i < 9 ; ++$i){ $First = $First + 7 ; } ******************* cheers Jack jacky@activelifestyle.com "There is nothing more rewarding than reaching the goal you set for yourself"