calendar.rb

module ApplicationHelper

  def calendar(date = Date.today)
    d1 = date.beginning_of_month
    d2 = date.end_of_month

    month = []
    current = d1.beginning_of_week(:sunday)

    while current <= d2
      week = []
      (0..6).each do |wd|
        week << (current + wd)
      end

      current = current + 7
      month << week
    end

    month
  end
end