TIL that `defvar` in #emacs-lisp won't update a variable's value if it's already been set. No wonder I've been getting dates from last week, when I've been trying to get today's.
Documentation string on a variable is pretty rad, though.
Noted this, as well as some other things I learned when writing emacs-lisp: https://newschematic.org/blog/writing-an-elisp-function/
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