[fix #3342] show date with format letter

app/helpers/application_helper.rb

@@ -119,4 +119,20 @@ module ApplicationHelper
       {}
     end
   end
+
+  def try_format_date(date)
+    begin
+      Date.parse(date).strftime("%d %B %Y")
+    rescue
+      date
+    end
+  end
+
+  def try_format_datetime(datetime)
+    begin
+      Time.zone.parse(datetime).strftime("%d %B %Y %R")
+    rescue
+      datetime
+    end
+  end
 end