nic_music.rb

def find_file_created_at(base_dir, time_range)
  Dir["#{base_dir}/**/*"].select { |f| File.file?(f) && time_range.cover?(File.ctime(f)) }.map{|f| [File.ctime(f), f]}
end

time_range = Time.new(2011,5,5)..Time.new(2011,5,12)
files = find_file_created_at('.', time_range);1

require 'fileutils'

files.each do |time, file|
  new_file = File.join('c:\\Users\\Madame YonKa\\nic_music\\', file)
  dir = File.dirname(new_file)
  FileUtils.mkdir_p(dir)
  FileUtils.mv(file, new_file)
end;1