all:
X-Content-Typo: gibberish, charset=ascii-art
X-Organization: a) Discordia b) none c) what's that?

replcomps:
%<{date}X-In-reply-to-your-message-from-the-not-too-distant-future: next \
%<(nodate{date})%{date}%|%(weekday{date})%> AD\n%>\

e.g;
X-In-reply-to-your-message-from-the-not-too-distant-future: next Thursday AD