1. A method, comprising: executing machine-readable instructions by a special purpose computing apparatus, wherein the executing the instructions results in the following being performed: generating a query, by the special purpose computing apparatus, based, at least in part, on one or more features or characteristics of an electronic document at least partially in response to the electronic document being accessed by a user, wherein the generating the query comprises generating one or more digital signals comprising the query; and obtaining one or more digital signals comprising one or more predictions comprising one or more sentence portions having one or more references to one or more future dates based at least in part on a comparison of the one or more digital signals comprising the query with one or more digital signals comprising a prediction index, wherein the one or more digital signals comprising the one or more predictions are extracted from a temporal collection of documents comprising at least personal emails.