erlang/otp — pull request #529 by ttyerlsol (2014-11-03 16:53:32+00:00)
Title: iso_week_to_date/3 

Added iso_week_to_date/3 which takes ISO Week, year and day of the week and finding the date associated with it.
Used: http://en.wikipedia.org/wiki/ISO_week_date as reference.