Tim Urban of Wait but Why wrote a post discussing the week as a natural chunk in which to subdivide life. https://waitbutwhy.com/2014/05/life-weeks.html It is a good idea - the week is a very natural unit - indeed the week based system has been in use far longer than our calendar. He even provides some basic posters with 52 x 90 blocks that you can mark up.
But I wanted to do something more sophisticated. First of all, I'm lazy, and the idea of physically looking up dates and counting out the weeks seemed like a job for the computer to do. Second, there are 52 weeks plus one day in each year, except leap years which have two extra days. Which is a minor difference, except when it's not. After a couple decades, theres some missing weeks, and the week count will move around noticeably relative to the seasons.
Thus was born the life as weeks generator. Intended to take a list of dates, and some options, it generates a day-accurate chart of weeks, with the calendar overlaid.