gistfile1.erb

<dl class="field">
  <dt>status</dt>
  <dd><%= f.radio_button :published, false %><%= f.label :published, " #{t('publisher.draft')}", :value => false %></dd>
  <dd><%= f.radio_button :published, true %><%= f.label :published, " #{t('publisher.published')}", :value => true %></dd>
</dl>
<dl class="field">
  <dt><%= f.label :published_at %></dt>
  <dd>
    <%= f.text_field :published_at, value: object.published_at.try(:strftime, '%d/%m/%Y'), class: 'datepicker' %>
  </dd>
</dl>