Here's a guide of sorts.
If you need to find your VIN, you can first check any documentation you have for the vehicle, such as:
Vehicle title.
Registration card.
Insurance documents.
Owner's manual.
Body shop repair records.
Police reports.
Vehicle history report.
Once you have the Vin you can look at two numbers to determine the manufacture date.
Manufacturer: Chevrolet
VIN Characters: 17 (beginning with MA6...)
Decode:
7th character represents the MONTH of Manufacture
9th character represents the YEAR of Manufacture
Month Codes:
A = JAN
B = FEB
C = MAR
D = APR
E = MAY
F = JUN
G = JUL
H = AUG
J = SEP
K = OCT
L = NOV
M = DEC
Year Codes:
A = 2010
B = 2011
C = 2012
D = 2013
E = 2014
F = 2015
G = 2016
H = 2017
J = 2018
K = 2019
I found this on a GM truck forum but it should work the same.