= form_for(@registration_period, url: admin_conference_registration_period_path(@conference.short_title)) do |f|
  .form-group
    = f.label :start_date
    %abbr{title: 'This field is required'} *
    = f.text_field :start_date, required: true, 'data-end-conference': @conference.end_date.to_s, id: 'registration-period-start-datepicker', class: 'form-control'
  .form-group
    = f.label :end_date
    %abbr{title: 'This field is required'} *
    = f.text_field :end_date, required: true, id: 'registration-period-end-datepicker', class: 'form-control'
  %p.text-right
    = f.submit 'Save Registration Period', class: 'btn btn-primary'