Ruby DateTime YAML extensions

I'm writing a plugin for a rails app to allow yaml to serialize and  
deserialize DateTimes, especially datetimes that are beyond the range  
of what a Time Object can store

Basically, I want
   require 'date'
   require 'time'
   require 'yaml'
   YAML::load(DateTime.now.to_yaml).class
to return DateTime instead of time.

Here's the ruby code I came up with

require 'yaml'
require 'date'
require 'time'
class DateTime
   yaml_as "tag:yaml.org,2002:timestamp"
   yaml_as "tag:ruby.yaml.org,2002:#{self}"
   def to_yaml( opts = {} )
     YAML::quick_emit( nil, opts ) do |out|
       out.scalar(taguri,self.to_s, :plain)
     end
   end
   def self.yaml_new( klass, tag, val )
     DateTime.parse(val)
   end
end

And here's the test code

class YamlDatetimeFixTest < Test::Unit::TestCase
   def setup
     @fardate = DateTime.new(1999,1,1)
   end
   # Replace this with your real tests.
   def test_this_plugin
     assert_equal(DateTime,YAML::load(DateTime.now.to_yaml).class)
     yml = @fardate.to_yaml
     puts yml
     begin
       res = YAML::load(yml)
       puts res.to_s
     rescue Exception => e
       puts "fail"
     end
     assert_equal(res.class, DateTime)
   end
end

I get these results:
Started
--- !ruby/DateTime 1999-01-01T00:00:00+00:00
1999-01-01T00:00:00+00:00
.
Finished in 0.012187 seconds.

1 tests, 2 assertions, 0 failures, 0 errors

I think I have everything down, but the one thing that just seems to  
bug me is my DateTime.to_yaml line of code outputs

--- !ruby/DateTime 1999-01-01T00:00:00+00:00
instead of
--- 1999-01-01T00:00:00+00:00

Is there a way to fix this? I could really welcome the help.

Thanks!

I'm in irc.freenode.net#yaml as samgranieri as well.


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