You will need to find your serial/ model tag and
record the numbers and letters on this, then looking at the first four digits
you should be able to work out the manufacture date.
Serial example - XL1601009
Break this up to take the first 4 digits i.e. XL16
2001, the 16th week
X is factory where the product was made.
L is the year ( J = 1999, K = 2000, L = 2001, M = 2002, N =2003, etc)
16 = week produced