/usr/bin/perl -MCPAN -e install Time::Piece
/usr/local/bin/perl -MCPAN -e install DBI
@Eric Leschinski, Your comment has nothing to do with this thread. You apparently installed a module into the non-default directory (and thus had to tell Perl where to look for it), but that's not what the OP is doing.
I understand now. The command you provided /usr/bin/perl -MCPAN -e install Time::Piece picks the wrong default installation directory and my perl couldn't find it. The user has to install it in the right place or else perl won't find it.
One more thing, in the Perl program, you have to manually tell it where to look. So I had to put this code line: use lib "/home/el/perl5/lib/perl5/x86_64-linux-thread-multi"; before the invocation of: use Time::Piece; in my perl program. I was able to find which path to use by running the command: locate Piece.pm
You don't have DBI installed for /usr/local/bin/perl, so install it.
You don't have Time::Piece installed for /usr/bin/perl, so install it.