code: func (l Location) IsRecent() bool {
  	yesterday := time.Now().AddDate(0, 0, -1)
  	return l.CreatedAt.After(yesterday)
  }
docs: // IsRecent is a helper function to determine if the user's location was last
  // recorded in the past day. Beyond that, itsabot.org/abot/shared/knowledge
  // will request an updated location.