def index
    @specific = Date.new(params[:year].to_i ||= 2009, params[:month].to_i ||= 01, params[:day].to_i ||= 01)
    if params[:day]
      @entries = Entry.by_day(@specific)
    else if params[:month]
      @entries = Entry.by_month(@specific)
    else if params[:year]
      @entries = Entry.by_year(@specific)
    else
      @entries = Entry.all
    end

    respond_to do |format|
      format.html # index.html.erb
      format.xml  { render :xml => @entries }
    end
  end