Reference week of monthly data

I was looking for the “reference week” of monthly data by CPS. i.e. I was looking for the exact date/week in a month that the monthly survey takes place. I could not find anything in the sampling notes or sampling design. I was wondering if other users had looked for the same thing and had some leads on this. Many thanks!

From the Census Bureau (source):

Typically, the week containing the 19th of the month is the interview week. The week containing the 12th is the reference week (i.e., the week about which the labor force questions are asked). In December, the week containing the 12th is used as interview week, provided the reference week (in this case the week containing the 5th) falls entirely within the month of December.