Good morning, J-M-L.
You posted here very important things for me to study, because I am not at the level of being able to unravel as you have posted.
Fantastico what you wrote, I have done a lot of research and I do not find anything that helps me. I hope this post can help people who are studying like me!
If you want to take into account the exact day in the calendar you can use unixTime
As for unixTime I still have no idea how it works but I hope to know how it works!
I thank you and have a good day.