Thanks Shripad
>From your advice I've got the following. It worked fine until I added 
hours and minutes to the range which are attributes 4i and 5i. I don't 
get any error messages but don't get values from db either. Datetime 
format in the db is 2003-10-14 12:37:51. Any suggestions would be 
appreciated.

my view:

    <table>
      <tr>
        <%= start_form_tag :action => 'time_range' %>
        <td ><%=  datetime_select("sd", "range") %></td>
        <td ><%=  datetime_select("ed", "range") %></td>
        <td><%= submit_tag 'go'%></td>
      </tr>
    </table>

my method:

def time_range
  @start_date = DateTime.civil(params[:sd][:"range(1i)"].to_i, 
params[:sd][:"range(2i)"].to_i, 
params[:sd][:"range(3i)"].to_i,params[:sd][:"range(4i)"].to_i, 
params[:sd][:"range(5i)"].to_i)

  @end_date = 
DateTime.civil(params[:ed][:"range(1i)"].to_i,params[:ed][:"range(2i)"].to_i,params[:ed][:"range(3i)"].to_i,params[:ed][:"range(4i)"].to_i,
 
params[:ed][:"range(5i)"].to_i)

  @orders=Order.find(:all,:conditions => ['created_at BETWEEN ? AND ?',
@start_date, @end_date])

end
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