I just bought a couple of cases of CCI .22LR ammo (Blazer and Mini-Mags) and wondered what the manufacture date on them was. I found the following info via Google:

Since 1995 SPEER/CCI products have used lot numbers that allow you to discern their date of manufacture. These lot numbers are in the form of L##L##, where L is a letter and # is a number. The first letter is the month A thru M, January thru December, skipping I (it might be mistaken for a 1). The next two numbers are the numerical day of the month 01 thru 31, single digit dates getting a leading zero. The second letter is the year A thru EA, skipping I and O (which might be mistaken for 1 and 0), for 1995 thru 2023. The purpose of the numbers following these is unknown to me.

First letter/Month:
A - January
B - February
C - March
D - April
E - May
F - June
G - July
H - August
J - September
K - October
L - November
M - December

First two digits/Numerical date:
01-31

Second letter/Year:
A - 1995
B - 1996
C - 1997
D - 1998
E - 1999
F - 2000
G - 2001
H - 2002
J - 2003
K - 2004
L - 2005
M - 2006
N - 2007
P - 2008
Q - 2009
R - 2010
S - 2011
T - 2012
U - 2013
V - 2014
W - 2015
X - 2016
Y - 2017
Z - 2018
AA - 2019
BA - 2020
CA - 2021
DA - 2022
EA - 2023

One case is Lot D12EA06 which would be April 12, 2023, and the other is F26EA06 which would be June 26, 2023. I also have an old case of Blazer that is Lot A12S24 which would be January 12, 2011, which sounds about right as to when I bought it.

Hope this is helpful.

Alphanumerics at the right end could indicate the loading line, inspector, etc. That is not unusual with other manufacturers date codes. I have Winchester, Western, and Remington codes. At one time Winchester and Western codes were different, but they now use the same system. No idea what Remington uses today after the big shakeup. Maybe the same as CCI.