sorting files by date

Hi, I have a dir of files saved in the following format: YYYY-MM-DD.mp4. I know how to get the file names into an array, but I don't know how to sort the array so that the files appear in date order. My guess was to use strtotime() to get the date into a timestamp, then sort on the timestamp, but there MUST be an easier way :) I've read through most of the array part of the manual, but can't see what I need. Justin