Hi, everybody:

I have been tring to derive a class from DateTime and in doing so have come across some nasty problems: it turns out overriding the constructor is not straight forward at all. I was looking for some pointers, anyone????
Here is what I have:

require 'rubygems'
#~ require 'ruby-debug'

require 'date'
class Event < DateTime
class << self
alias :old_new :new
def new summary, due_date, long_text='', alarm_time=0
dt = DateTime.parse( due_date )
obj = old_new(dt.year, dt.month, dt.day, dt.hour, dt.min, dt.sec, dt.sg)
obj.send :initialize, summary, long_text, alarm_time
obj
end
end

attr_accessor :summary, :long_text, :alarm_time

def initialize summary, long_text='', alarm_time=0
@summary = summary
@long_text = long_text
@alarm_time = alarm_time
end
end

e = Event.new "something to do", "2009-10-10T00:00"
puts e.summary
puts e.year

e is an event at the end of the code, it has a summary and what ever else I pass in but the DateTime structures are not initialized correctly. In other words e.year gives me an error and here it is:

/usr/lib/ruby/1.8/date.rb:492:in `ajd_to_jd': undefined method `+' for nil:NilClass (NoMethodError)
from /usr/lib/ruby/1.8/date.rb:1051:in `__21105__'
from (eval):4:in `jd'
from /usr/lib/ruby/1.8/date.rb:1066:in `__21521__'
from (eval):4:in `civil'
from /usr/lib/ruby/1.8/date.rb:1081:in `year'
from D:/workspace/todo/lib/tester.rb:29

I have tryed some other variants of the code as well and it gets even worse. Can any one help, please?
Bye, Luis