payday logic

payday.rb

def is_payday?(t)
  return true if (t.end_of_month.saturday? || t.end_of_month.sunday?) && t.friday?
  return true if [13, 14].include?(t.day) && t.friday?
  return true if (t.end_of_month == t.midnight || t.day == 15) && !(t.saturday? || t.sunday?)
  return false
end

@time = DateTime.now
100.times do |i|
  t = @time.advance(days: i)
  puts t.strftime("%D #{ is_payday?(t) }")
end