I have lived in America all my life and have never even once heard somebody talk about a week number. The only exception I know of is that electronics geeks som

I have lived in America all my life and have never even once heard somebody talk about a week number. The only exception I know of is that electronics geeks sometimes know about the concept because often electronic components have a date code that is the year and week of their manufacture. This is where I got the idea anyway. So, if there is a US standard, most Americans are not aware of it -- even electronics geeks would only bring it up when actively decoding some markings on a suspicious chip.