I just tested out LLLL.
This would result in a format like this:
Friday, June 11, 2021 11:29am
The reason this doesn’t work is because you are not allowed to use : colon characters in a filename in Obsidian. If you’d like a similar format, I suggest this format:
dddd, MMMM D, YYYY HHmm
This is the same format, except it rebuilds it without the colon in the time.
I personally use this format, which I find pretty readable. I don’t care so much about the human-readable names in the date:
YYYY-MM-DD-HHmm
which results in:
2021-06-11-1129
In my Daily Notes, I do care about the week day, but not the time. So I use this:
YYYY-MM-DD_dddd
Which appends “Friday” on the end. 2021-06-11_Friday