Issue #7760 has been updated by Hiroshi SHIBATA. Status changed from Open to Feedback It's already fixed in trunk, 2.1.0 and 2.0.0 HEAD revision. Ruby 1.9 is only security maintenance phase. I think this issue should be closed. ---------------------------------------- Bug #7760: "-\n2000-01-02 03:04:05".to_yaml raise ArgumentError https://bugs.ruby-lang.org/issues/7760#change-48296 * Author: Kazuhiro NISHIYAMA * Status: Feedback * Priority: Normal * Assignee: Aaron Patterson * Category: lib * Target version: next minor * ruby -v: ruby 1.9.3p374 (2013-01-15 revision 38858) [x86_64-darwin12.2.0] * Backport: ---------------------------------------- 1.9.3's psych raises ArgumentError. 2.0.0's psych doesn't. % ruby -v -r yaml -e '"-\n2000-01-02 03:04:05".to_yaml' ruby 1.9.3p374 (2013-01-15 revision 38858) [x86_64-darwin12.2.0] /Users/kazu/.rbenv/versions/1.9.3-p374/lib/ruby/1.9.1/psych/scalar_scanner.rb:111:in `utc': argument out of range (ArgumentError) from /Users/kazu/.rbenv/versions/1.9.3-p374/lib/ruby/1.9.1/psych/scalar_scanner.rb:111:in `parse_time' from /Users/kazu/.rbenv/versions/1.9.3-p374/lib/ruby/1.9.1/psych/scalar_scanner.rb:48:in `tokenize' from /Users/kazu/.rbenv/versions/1.9.3-p374/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:242:in `visit_String' from /Users/kazu/.rbenv/versions/1.9.3-p374/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:103:in `accept' from /Users/kazu/.rbenv/versions/1.9.3-p374/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:67:in `push' from /Users/kazu/.rbenv/versions/1.9.3-p374/lib/ruby/1.9.1/psych.rb:242:in `dump' from /Users/kazu/.rbenv/versions/1.9.3-p374/lib/ruby/1.9.1/psych/core_ext.rb:14:in `psych_to_yaml' from -e:1:in `<main>' -- https://bugs.ruby-lang.org/