$ cpanm Time::Piece
Time::Piece is up to date. (1.29)
$ cpanm Time::Piece::Plus
Time::Piece::Plus is up to date. (0.05)
$ perldoc -t Time::Piece | grep -i zone
        $t->tzoffset            # timezone offset in a Time::Seconds object
$ perldoc -t Time::Piece::Plus | grep -i zone
$