comparing with past dates

[clairence]

I'm probably just tired, because I'm not understanding the php manual and not finding a relevant thread on this topic here. So here goes...

I have form data that is stored in a db. The current date I have stored as well, using this little script:

$differencetolocaltime=3;
$new_U=date("U")-$differencetolocaltime*3600;
$time=date("F j, Y, g:i a",$new_U);

Now, when I visit a certain page on my site, I want to browse the database and if the current date is 4weeks past that original date, then I will make a change to that particular record.

I know this is probably simple stuff, but I can't figure out how to compare right now with the stored date, and see if it's been >4weeks since the form submission.

Will some patient person please help me out?

Thanks