Date format options

[David-A-RogersHS2]

Is there a way to specify the date format? Something I could set in vimoutlinerrc, perhaps? I have a running todo/done list with this format heading for each day:

Wed 01 Feb 2023

Which I currently create like this: inoremap <C-d> <C-R>=strftime('%a %d %b %Y')<CR>

It would be nice to get the same result from vimoutliner's \d in insert mode.