Views Filtering by Delta and/or Date

I'm posting this to verify that I'm filtering repeated dates with delta correctly. I was trying to display upcoming events in a block and I couldn't figure out how to show only one of the next upcoming events of a series in a featured (featured is just another cck field) block. I was under the impression that the value to use when filtering with "Content: Date (field_date) - delta" should have been an integer (0,1,2,3..etc.), and that was an issue because filtering based on a specific instance of the repeated event wasn't going to help show only the date of the next upcoming event.

On a whim, I tried using "Content: Date (field_date) - delta" equal to "now" and it actually worked, i.e. my view only showed the upcoming instance of the repeated event. Once again, I thought that delta values needed to be integers. How is this working?