extending Viney's validates_date_time

Greetings all,

I have added 2 required formats to this (helpful) validation plugin, but unfortunately this complicates (svn) deployment.

Viney, if you're out there, what is the best means to add date formats without compromising the local plugin source (ie through extension).

For others, perhaps this is a more generic problem : how to extend the following with additional regexs?

module ActiveRecord
   module Validations
     module DateTime
       module Parser
         class DateParseError < StandardError #:nodoc:
         end
         class TimeParseError < StandardError #:nodoc:
         end
         class DateTimeParseError < StandardError #:nodoc:
         end

         class << self
           def parse_date(value)
             raise if value.blank?
             return value if value.is_a?(Date)
             return value.to_date if value.is_a?(Time)
             raise unless value.is_a?(String)

             year, month, day = case value.strip
               # 22/1/06, 22\1\06 or 22.1.06
               when /^(\d{1,2})[\\\/\.-](\d{1,2})[\\\/\.-](\d{2}|\d{4})$/
                 ActiveRecord::Validations::DateTime.us_date_format ? [$3, $1, $2] : [$3, $2, $1]
               # 22 Feb 06 or 1 jun 2001
               when /^(\d{1,2}) (\w{3,9}) (\d{2}|\d{4})$/
                 [$3, $2, $1]
               # July 1 2005
               when /^(\w{3,9}) (\d{1,2}) (\d{2}|\d{4})$/
                 [$3, $1, $2]
               # 2006-01-01
               when /^(\d{4})-(\d{2})-(\d{2})$/
                 [$1, $2, $3]
               # 2006-Sep-01
               when /^(\d{4})-(\w{3,9})-(\d{2})$/
                 [$1, $2, $3]
               # 2006-9-01
               when /^(\d{4})-(\d{1,2})-(\d{2})$/
                 [$1, $2, $3]
               # Not a valid date string
               else raise
             end

             Date.new(unambiguous_year(year), month_index(month), day.to_i)
           rescue
             raise DateParseError
           end

Thank you for your thoughts.
Jodi