Help decipher these lubricant container date codes …

[CK9887]

Mobil 1 75-140 gear oil and Pentosin DOT 4 brake fluid. Just picked up from NAPA

 

[MolaKule]

The gear lube appears to have been bottled on the 22nd day of December 2013. Can't see the Dot code clearly as I am on my SP.

 

[Adkcedarman]

M1 around April 30th 2017
Brake Fluid is 2016

Neither company seems to publicly release their date coding method, so this is based on community tricks ive learned.