Finding the Manufacturing Date on Cisco Switches

switch# show version

The serial number is in this format: LLLYYWWSSSS

LLL = location of the supplier
YY = year of manufacture
WW = week of manufacture
SSSS = serial-id

Year codes:
01 = 1997
02 = 1998
03 = 1999
04 = 2000
05 = 2001
06 = 2002
07 = 2003
08 = 2004
09 = 2005
10 = 2006
11 = 2007
12 = 2008