Rails undefined method `strftime' for "2013-03-06":String

It looks like your duedate is a string, when strftime is a method for Time/Date class. You can try this:

Date.parse(task.duedate).strftime("%B %e, %Y")

This solved the issue for me:

Date.created_at.try(:strftime, ("%B %e, %Y"))

Hope this helps!