On Aug 7, 2012, at 11:55 AM, Steve Atkins wrote: Something like this? Thanks very much. I checked several examples of short, medium and long intervals (in the context of my data set) and your solution returns all of them exactly as they were in the text files which I used to import the data. That's as much accuracy as I need. I don't even know the exact standard used by the source for a month, though I could ask if it becomes an issue. -Aram Fingal |