Issue #7760 has been updated by zzak (Zachary Scott).


I cannot reproduce this with trunk:

ruby -v -rpsych -e 'p "-\n2000-01-02 03:04:05".to_yaml'
ruby 2.1.0dev (2013-08-02 trunk 42318) [x86_64-darwin12.4.0]
"--- |-\n  -\n  2000-01-02 03:04:05\n"

Try to update your installation of Psych?
----------------------------------------
Bug #7760: "-\n2000-01-02 03:04:05".to_yaml raise ArgumentError
https://bugs.ruby-lang.org/issues/7760#change-41153

Author: znz (Kazuhiro NISHIYAMA)
Status: Open
Priority: Normal
Assignee: tenderlovemaking (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>'



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