Rails2.3.6, Ruby1.9.3 twitter-bootstrap 使用 class 追加前の例 <div class="field"> <%= f.label :start_date, "日程" %> 開始<%= f.date_select :start_date, include_blank: true, selected: @hoge.start_date} %><br /> 終了<%= f.date_select :end_date, include_blank: true, </div>…