Au I’ve just explained on a separate thread - until v9.0.0 is patched, I can’t repair the all atbref broken links (there are some 4,700 of them!). But for this Date-type question the v8 pages still work. See Date Comparisons - Date vs. Date/time
I’m unclear as to what you mean by ‘Index’. Emacs is a different program with a different design, so it does not help much as a reference.
Are you trying to rename a note based on its creation date/time? If so your example above will work, i.e.
(note: use straight not ‘curly’ double-quotes)