Index posts by a custom post type field

Hello everybody. I need some help from you all.

I’m using “custom post types” to develope an “agenda” for my costumer. It’s too simple. It has some fields like “name”, “date”, “hour”, “where” and “date_limit” (I don’t want to show old items in agenda)

So, I would like to index the records by “date_limit” and filter the records excluding only the oldest.

Is it possible? How can I do this?

Best regards!