[colicoid]

This can be done in different ways.

1. Review system. If you want to reminded about something in 3 months from now you set the "next review date" to the desired date. Then after 3 months it will appear during reviews. This only works as long as you do regular reviews.

2. Pushing due dates around. If you set the start and end date to the same future date, the item will popup and turn red when that date arrives. Unfortunately you cannot set the project on hold because even if something is red and due today, if it is on-hold you won't see it. So you have to keep these projects active and fiddle with the filters instead.

OF was meant to be used with method no 1 which I recommend. Method no 2 forces you to push due dates around and is not true GTD because you might set hard dates for stuff that is not "hard". Some people use it anyway because they like the fact that these items kind of popup in your face a bit more.