Adds DateTime#to_s
Adds DateTime#to_s

nobu/rubyspec,sgarciac/spec,nobu/rubyspec,ruby/spec,eregon/rubyspec,sgarciac/spec,ruby/spec,sgarciac/spec,ruby/rubyspec,eregon/rubyspec,ruby/rubyspec,nobu/rubyspec,ruby/spec,eregon/rubyspec