most people would not have any idea how to date code a motor or a part that has the coding on it but would have heard about it..its very easy..
to start i will only explain australian date coding as anyone interested in a sandman, these vehicles will have this system..
what you will see is a number or numbers and a letter and then another number...lets say 28D5..sometimes a d on a motor as a rough casting may look like an O..there is no o in date coding.
anyhow....:errf:
A=JAN
B=FEB
C=MAR
D=APR
E=MAY
F=JUNE
G=JULY
H=AUG
I=NOTHING as it can be confused with the number 1..so they skipped I :Chin:
J=SEPT
K=OCT
L=NOV
M=DEC
the numbers will correspond with the amount of days in that particular month.
so we have numbers first then the letter and the number at the end is.....
the year...so 28D5 is the 28th day of april 1975....

i shall explain later about american date coding....why you ask...:errf:
because gmh used american date coding on its australian motors till llate 1972 somewhere..i just need to verify a date if its known...