my @time_limits;

my $t = XML::Twig->new(
    twig_handlers => {
        timeLimit => sub {
            my $atts = $_->atts;
            if (exists $atts->{startTime} && exists $atts->{endTime}) {
                push @time_limits, [$atts->{startTime}, $atts->{endTime}];
            }
        },
    },
);

$t->parse($xml);
print "[$_->[0]], [$_->[1]]\n" foreach @time_limits;