Issue #5906 has been updated by Zachary Scott. File 0001-test-csv-test_data_converters.rb-test_builtin_date_time_converter_with_stamp.patch added I've added a failing test to confirm this. ---------------------------------------- Bug #5906: CSV converter option fails in case of :date_time https://bugs.ruby-lang.org/issues/5906 Author: siep korteling Status: Assigned Priority: Normal Assignee: James Gray Category: lib Target version: ruby -v: ruby 1.9.3p0 (2011-10-30 revision 33570) [i686-linux] The built-in converters of CSV with the name :date_time does not convert dates, nor does the :any converter -- http://bugs.ruby-lang.org/