The letters of the month begin with n, and n =1p = 2q = 3r = 4s = 5t = 6u = 7v = 8w = 9x =10y =1z =12 (o is not similar to 0 either).
So if your 4-digit batch number is really 9w0 1, it means it is not normal. The longest shelf life of cosmetics is only 5 years. You bought futures!