You could do the command:
ls -laR / | grep "2008-01-11"
which will scan all your root directory recursively. It took me about 4 minutes to scan 10 GB. You must be a superuser to see all the files. There's probably a more efficient way... Look for the command "locate" maybe.
Note: The date in the "ls" output is not necessarily the creation date. It could be also a date for a modification of the file.