gistfile1.rb

map.connect 'orders/:date_from', 
    :controller => 'orders', 
    :action => 'index', 
    :date_from => Time.new

gistfile2.rb

map.connect 'orders/:date_from', 
    :controller => 'orders', 
    :action => 'index', 
    :date_from => lambda {Time.new}