Everyone collects utilities, and most folks have a list of a few that they feel are indispensable. Here's mine. Each has a distinct purpose, and I probably touch each at least a few times a week. For me, "util" means utilitarian and it means don't clutter my tray. If it saves me time, and seamlessly integrates with my life, it's the bomb. Many/most are free some aren't. Those that aren't free are very likely worth your 30-day trial, and very likely worth your money.

These are all well loved and oft-used utilities. I wouldn't recommend them if I didn't use them constantly. Things on this list are here because I dig them. No one paid money to be on this list and no money is accepted to be on this list.

use utf8; does not enable Unicode output - it enables you to type Unicode in your program. Add this to the program, before your print() statement:

binmode(STDOUT, ":utf8");

See if that helps. That should make STDOUT output in UTF-8 instead of ordinary ASCII.

You want to use the -newermt option for find:

find /media/WD/backup/osool/olddata/ -newermt 20120101 -not -newermt 20130101

to get all the files with modification time in 2012.