i don't know that there is a specific rails method to do that. however, something like this should do the trick.
def hms(secs) h, secs = secs.divmod(3600) m, s = secs.divmod(60) h = h.to_s.rjust(2, "0") m = m.to_s.rjust(2, "0") s = s.round.to_s.rjust(2, "0") "#{h}:#{m}:#{s}" end
put that in your application_helper.rb file
<%= hms(@object.duration_in_secs) -%>