Rails - Aug 2006 - sort_link_helper , sorting on date

I am using this helper to sort my table colums, no problem sorting on 
string but how can I sort a date colum ( in my DB, )

user_helper.rb  ----------------------
def sort_link_helper(text, param)
  key = param
  key += "_reverse" if @params[:sort] == param
  options = {
      :url => {:action => ''list'', :params =>
@params.merge({:sort =>
key, :page => nil})},
      :update => ''table'',
      :before => "Element.show(''spinner'')",
      :success => "Element.hide(''spinner'')"
  }
  html_options = {
    :title => "Sort by this field",
    :href => url_for(:action => ''list'', :params =>
@params.merge({:sort
=> key, :page => nil}))
  }
  link_to_remote(text, options, html_options)
end

_user_list.rhtml ----------------------- (partial in my list.rhtml)
 <tr class="tbl_header">
<td align="center"   <%= sort_td_class_helper
"startdate"%>><%=
sort_link_helper "Start", "startdate"></td>
....  table item line -----------
<td width="30%" align="center"><%=
h(booking.startdate.loc("%a %d %b"))
%></td>

I am using paginate in my controller with the sort parameter
user_controller.rb ----------
def list
@bookings = paginate(:bookings, :order => sort,......

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