You need to get rid of the "/"'s and treat the dates as numbers.
code:
// expiration date
expiration = "282004";
// new date object
todaysDate = new Date();
// day of month
currentDate = todaysDate.getDate();
// month of year (add 1 because this returns 0-11)
currentMonth = todaysDate.getMonth() + 1;
// year (4 digits)
currentYear = todaysDate.getFullYear();
// put them together
current = currentMonth add currentDate add currentYear;
// Compare dates
if (Number(current) >= Number(expiration)) {
// Request payment
}else{
// Work as normal
}
When you do this be sure to make your client aware of it, unless you don't want any future work from him.