Long time lurker, first time posting. I have data broken into uneven time intervals such as 1/2/2012 13:30 - 1/2/2012 14:05. I want to be able to filter on 20 minute intervals, e.g., 2/15/2012 12:00 - 2/15/2012 12:20. The need to have neat 20 minute intervals isn't a priority, but the need to have a full timestamp filter is. I've looked through many of the forum posts related to this type of thing but the filters are usually too wide (filter just by year, just by hour regardless of date, etc.).