A Scheme rewrite of the infamous Snoopy calendar, which was originally written in 1960s. The shtick is that it picks a random year in the near past whose calendar matches this year’s and displays that. (eg 1964 in 2020)
Requires an R6RS conformant Scheme (although it could be trivially ported to R7RS Small) and SRFIs 1, 19 (to get the current date), 27 (to randomise past years) and 37 (to parse command line arguments).
Akku can aid you with dependencies:
% akku lock
% akku install
% .akku/env
% bin/snoopy.sps