Calendar for the current month

home_controller.rb

class HomeController < ApplicationController
  def index
    @today = Date.today
    @days_in_month = []
    @days_in_month[@today.beginning_of_month.cwday] = (@today.beginning_of_month.day..@today.end_of_month.day).to_a
    @days_in_month = @days_in_month.flatten.in_groups_of(7)
  end
end

index.html.haml

%table{border: 1}
  %tr
    - Date::DAYNAMES.each do |day_of_week|
      %th= day_of_week
  %tr
    - @days_in_month.each do |week|
      %tr
        - week.each do |day|
          %td=raw day ? day : " "