diff --git a/app/views/admin/surveys/answer_sets.html.erb b/app/views/admin/surveys/answer_sets.html.erb
index 96cc55d..9fbdc58 100644
--- a/app/views/admin/surveys/answer_sets.html.erb
+++ b/app/views/admin/surveys/answer_sets.html.erb
@@ -285,7 +285,7 @@
   	<% else %>
   		<td>NA</td>
   	<% end %>
-  	<td><%= (@is_answer_list ? sa.created_at : sa.last_modified).strftime((I18n.locale == :zh_tw ? "%Y/%m/%d %H:%M" : "%h %d, %Y  -  %H:%M")) rescue nil %></td>
+  	<td><%= (answers_nil ? sa.last_modified : sa.created_at).strftime((I18n.locale == :zh_tw ? "%Y/%m/%d %H:%M" : "%h %d, %Y  -  %H:%M")) rescue nil %></td>
   	<td>
       <% if @answer_repeat && !@is_answer_list %>
         <a class="btn btn-primary" href="/admin/surveys/<%= sa.id.to_s %>/answer_list"><%= t("survey.view") %>(<%=sa.survey_answer_ids.count%>)</a>