A script to list upcoming Fridays 12th.

friday12th.py

#!/usr/bin/env python

from datetime import date, timedelta

def fridays_12th():
  d = date.today()
  while True:
    if d.weekday() == 4 and d.day == 12:
      yield d
    d += timedelta(days=1)

g = fridays_12th()

for _ in range(5):
  print g.next()

friday12th.rb

#!/usr/bin/env ruby

require 'date'

e = Enumerator.new do |yielder|
  d = Date.today
  loop do
    yielder << d if d.day == 12 && d.friday?
    d = d.next
  end
end

e.take(5).each do |d| puts d end