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GM Build Date Codes

 
Build Date
Code
Month
Code
Month
01 January 07 July
02 February 08 August
03 March 09 September
04 April 10 October
05 May 11 November
06 June 12 December
       
Code
Week
Code
Week
A 1st D 4th
B 2nd E 5th
C 3rd