Rails - Apr 2006 - how to inser value of datetime_select value in database

hi all
how to insert datetime_select value in database.
i have two fields in my form.rhtml
  
 
can any body tell how i can get this value.
i used in controller
def insert
   @order=Order.new(params[:stock])
   if @order.save
      render_text "record inserted"
   end
end
but it only enter stock name not date time value