my-program on the second Sunday of every month, a Guile
script like the following should suffice (it is left as an exercise to
the student to understand how this works!).
(job (lambda (current-time) (let* ((next-month (next-month-from current-time)) (first-day (tm:wday (localtime next-month))) (second-sunday (if (eqv? first-day 0) 8 (- 14 first-day)))) (+ next-month (* 24 60 60 second-sunday)))) "my-program")