I will eat my shoes if this does not work The chmod +x must put execute permissions on the file, or else you will encounter error messages. I will have to ask again, please execute exactly as written. You are not executing this on the file in MyDocs I hope, because that will never work (not supported in FAT32). Do the chmod to the file in /usr/bin/. This simply has to work. If you do not encounter error messages and it is still not executable, your devices is seriously corrupted. But I am still betting on some misunderstanding.
sudo gainroot /home/user # cd /usr/bin/ /usr/bin # chmod +x worldclock