Trocar essa coisa feia na view!! #Rails

create.html.erb

<!-- Atual -->
<td width="14%">
  <span>
    <%= i.date_select :expiration_date, {:order =>[:day, :month, :year], :default => Time.now + (60*60*24*30*number)}, {:class => 'select' } %>
  </span>
</td>

<!-- Alterar para: -->
<td width="14%">
  <span>
    <%= i.date_select :expiration_date, {:default => Time.now + number.months}, {:class => 'select' } %>
  </span>
</td>

<!-- app/views/receipts/create.html.erb -->
<!-- app/views/payments/create.html.erb -->

<% Time.now + 5.days + 7.hours + 3.minutes + 14.seconds # só por curiosidade ;) %>