How to decode some less common food Expiration Date/Date Manufactured codes (US)?
Manufacturers usually will decode the date if you call them, which I did. I am sharing the codes I have gathered for easier reference.  Other users may wish to click Edit and add other manufacturers' codes.

BRAND / CODE / TYPE(BEST-OR-MFG) / DECODE / NOTES


Lieber's: 021 T B4A1: BEST: The 021 is 21st day of the year i.e. Jan-21.  "T" (20th letter) is for 2019, as "A" is Year 2000.
Blooms: 028 B2 A1: MFG: The 028 is 28th day of the year i.e. Jan-28.  The year is not in the code.


Here is a list of some more common codes, from Bush Brothers to Stagg Chili:
http://www.foodreference.com/html/tcannedfoodshelflife.html#datecodes
Accessed July 2019

Here is another, very long list from 3 Springs Water through Zatarains:
http://www.eby-brown.com/sites/default/files/u3/EbyCodeDateCatalog_0.pdf
Accessed July 2019