I want to change emacs default calendar week number so that it starts at a manually preset date. Normally the year is broken into 52 weeks and week 1 is the one that contains the 1st of January. I'd like to be able to either change this date to another, 20 of July (say), or to have a second week number that gets displayed when org-agenda is called. Like so
Week-agenda (W01): Monday 20 July 2020 W01 Tuesday 21 July 2020 Wednesday 22 July 2020 Thursday 23 July 2020 Friday 24 July 2020 Saturday 25 July 2020 Sunday 26 July 2020
Week-agenda (W30 | W01): Monday 20 July 2020 W30 | W01 Tuesday 21 July 2020 Wednesday 22 July 2020 Thursday 23 July 2020 Friday 24 July 2020 Saturday 25 July 2020 Sunday 26 July 2020
These are the closest posts that I could find so far link1 link2. I am using emacs 26.3 and org 9.2.6. This question is relevant because at my work place the week system is offset from the normal week system, and it would be great to be able to adjust emacs to it.