I was migrating to a new machine the other day and realized that although I had made a backup of all my files, I had continued to work on some new ones for around a week.
This was a terrible thing to realize without this:
cd ~/whatever/folder/is/of/concern;
find . -newermt "jan 01, 2010 07:00" -not -newermt "jan 11, 2010" -exec cp {} ~/some/path \;
programming