I'm not sure if this feature is directly related to Vimwiki, but you could try an abbreviation:

inoreabbrev cdate <C-r>=strftime("%F")<CR>

Hi, thank you @qadzek for sharing your snippet. It is pretty nice and usefull. One should never have to enter today's date by hand on a computer.

I agree to add it to Vimwiki. But it may take time to accepted a default keymap, accept it and merge.

So I would advice users to have their own map or abbrv like @qadzek in their vimrc (PS: I just did it myself lol, it is such a nice abbrv).

@tinmarino Happy to make your vimrc a little longer 😄

In this case, I feel like an abbreviation makes more sense than a mapping, as you are probably in insert mode when wanting to add a date. That's a personal choice of course.

Let me share this one as well, if you want to add a timestamp like 09:47:36 (mnemonic: Current TIME):

inoreabbrev <expr> ctime strftime("%T")

The <expr> syntax is a bit nicer than the <C-r> used above.

To avoid inserting a trailing space after expanding the abbreviation, I use this

" See :helpgrep Eatchar
function! Eatchar(pat)
  let l:c = nr2char(getchar(0))
  return (l:c =~ a:pat) ? '' : l:c
endfunc

inoreabbrev cdate <C-r>=strftime("%F")<CR><C-r>=Eatchar('\s')<CR>