Creates a structure for your custom spreadsheet calender

calender.rb

# encoding: UTF-8

require 'active_support/all'

MONTHS = %w(Januar Februar März April Mai Juni Juli August September Oktober November Dezember)
DAYS = %w(So Mo Di Mi Do Fr Sa)

year = 2016

months = (1..12).map do |month|

  date = Date.new(year, month, 1)
  beginning_of_next_month = date.next_month
  
  month_column = []

  begin
    month_column << %|#{DAYS[date.wday]};#{date.day};|
    date += 1
  end while date != beginning_of_next_month
  month_column
end


4.times do |quarter|
  puts (0..2).map { |m| MONTHS[quarter * 3 + m] }.join(';')
  (0..30).each do |day|
    output = (0..2).map do |miq|
      day_str = months[quarter * 3 + miq] && months[quarter * 3 + miq][day]
      day_str || ';'
    end
    puts output.join(';')
  end
  puts
end