DIR() in date sequence?

I have a folder with thousands of files in it.

Listing the folder (along with all the attributes of each file like length, date, author etc.) takes a long time.

Using DIR() and a counter I can get the first 20 files (alphabetically). BUT...

Anyone know how I can get the last 20 files that have been added to the folder?? (i.e. reverse date sequence).

Thanks, Chris