ArgumentError in Popular#science_detail

Showing /home/rails/app/views/popular/science_detail.html.erb where line #45 raised:

invalid date

Extracted source (around line #45):

42
43
44
45
46
47
48
          
</div>
<div class="col-md-6 col-sm-12" style="height:auto; float:left; margin-top:10px;">
<% @pagesec.each do |pagesec| %>
<div style="width:auto; height:auto;float:left; background:rgba(0,0,0,0.2); padding:2px 10px; border-radius:5px;color:#ffffff"><%=Date.strptime(pagesec.name,"%Y-%m-%d").strftime("%A, %B %d, %Y") %></div><br />
<div style="width:auto; height:auto;margin-top:30px;float:left; background:rgba(255,255,255,0.5); padding:10px 20px; border-radius:5px;"><%= pagesec.content.html_safe %>
<% end %>
<hr style="border-top:1px solid #fff;" />

Rails.root: /home/rails

Application Trace | Framework Trace | Full Trace
app/views/popular/science_detail.html.erb:45:in `strptime'
app/views/popular/science_detail.html.erb:45:in `block in _app_views_popular_science_detail_html_erb__2951420414053238637_50705540'
app/views/popular/science_detail.html.erb:44:in `_app_views_popular_science_detail_html_erb__2951420414053238637_50705540'

Request

Parameters:

{"id"=>"mammoth-cloning-possible"}

Response

Headers:

None