Thanks for those links!
I thought non-ISO-formatted dates would be neat, too, and did a bit of looking for a date parser that supported internationalization, but (like most of npm), were either English-only, had no tests, had been abandoned, or all of the above.
I think just a could regexs would get year, month, week, and day parsing. Here’s a google sheet: please ask for edit access if you’d like to add a language or other examples.
tag:/a/b/c suffice (where /a/b/c is the entire path of the tag)?