Merge branch 'use-system' into module-refactor

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# especially if it merges an updated upstream into a topic branch.
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keep-the-records.scm

@@ -411,7 +411,7 @@
                                                                (string->number (todays-yyyy))))
                                 d1
                                 d2))
-          (filter (lambda (c) (birthday club c)) clubbers)))
+          (filter (lambda (c) (db->date (birthday club c))) clubbers)))
 
     ;; (filter (lambda (c)
     ;;           (let* ((c-b (birthday club c))