ever thought about our magical cookie..
actually its not magical but it is a cookie
setcookie("UploadFile","store some info from com" time()+606024);
you can read up on cookies and all that.. in the manual of course
now then to see if the cookie exists
if you use the cookie i had then this should work
if(!empty*$_COOKIE['UploadFile']))
{
execute what happens if they uploaded on that day
}
else
{
allow them to upload
}