my final 1064 error

[Matthew Stuart]

Here is my final problem that I am struggling to overcome...

SELECT Vouchers.VoucherID, Vouchers.VoucherCode, Vouchers.StartDate,  
Vouchers.EndDate, Vouchers.Discount, Vouchers.VoucherTypeID
FROM Vouchers
WHERE (((DateDiff('d',[StartDate],Date()))>=0) AND ((DateDiff('d', 
[EndDate],Date()))<=0));


Basically, the error is on the WHERE line of the query, and I assume  
it is something to do with the DateDiff, but I don't know if there is  
a MySQL equivalent. Also, is Date() valid MySQL?

Thanks.

Mat