Add red color to overdue and open issues

app/models/issue.rb

@@ -176,4 +176,12 @@ class Issue < ActiveRecord::Base
       self.related_branches(current_user).empty? &&
       self.closed_by_merge_requests(current_user).empty?
   end
+
+  def overdue?
+    if due_date
+      due_date.past?
+    else
+      false
+    end
+  end
 end

app/views/projects/issues/_issue.html.haml

@@ -49,6 +49,7 @@
         = icon('clock-o')
         = issue.milestone.title
     - if issue.due_date
+      %span{class: "#{'cred' if issue.overdue?}"}
          
         = icon('calendar')
         = issue.due_date.to_s(:medium)