I interpreted this as Jan 5, 2019. In my company, we use YYXDD format where X is the numeric month as letter of the alphabet. For example, July being the 7th month would be G, the seventh letter in the alphabet. Why do we do this? It sorts chronologically and eliminates the MMDD vs DDMM confusion that happens when you have both Europeans and Americans working for you. As we also use Dvorak keyboards, it usually only takes 6-8 months for the new guy to get up to speed 
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