for the base relevance, consider this one?
q: (it, (it - first monday of month_and_year of it)/week +1) of ( March 1 of 2019 + it * day) of integers in (0,30)
To translate into a simple calculator for today, March 20, we are in week 3 (based on Monday March 4 being the start of week 1)
q: (current date - first monday of current month_and_year)/week +1
You might note that for March 1, you get “week 0” instead of “week 4 of last month’s calendar” - I have not yet solved that edge.