output_for_4_years

We Found 52 Days, Yaaay:
2016-08-06
2016-08-13
2016-08-20
2016-08-27
2016-09-03
2016-09-10
2016-09-17
2016-09-24
2016-10-01
2016-10-08
2016-10-15
2016-10-22
2016-10-29
2016-11-05
2016-11-12
2016-11-19
2016-11-26
2016-12-03
2016-12-10
2016-12-17
2016-12-24
2016-12-31
2017-01-07
2017-01-14
2017-01-21
2017-01-28
2017-02-04
2017-02-11
2017-02-18
2017-02-25
2017-03-04
2017-03-11
2017-03-18
2017-03-25
2017-04-01
2017-04-08
2017-04-15
2017-04-22
2017-04-29
2017-05-06
2017-05-13
2017-05-20
2017-05-27
2017-06-03
2017-06-10
2017-06-17
2017-06-24
2017-07-01
2017-07-08
2017-07-15
2017-07-22
2017-07-29

valid_for_coup.rb

require 'date'

class Date
  VALID_FOR_YEARS = 4 # years

  def valid_for_coup?
    !(1..VALID_FOR_YEARS).any? do |year|
      day_in_future_year = next_year(year)
      day_in_future_year.friday? || day_in_future_year.saturday?
    end
  end
end

valid_days = (Date.today..Date.today.next_year).select(&:valid_for_coup?)

if valid_days.empty?
  puts "Oooooh, can't find any valid days."
else
  puts "We Found #{valid_days.size} Days, Yaaay:"
  puts valid_days
end