Hi,

...
my $dummy;
eval {
    $dummy = timelocal($sec,$min,$hour,$mday,$mon,$year);
};
...
[download]

will output:

$ perl 642627.pl
Day '31' out of range 1..29 at 642627.pl line 13
This is an invalid date.
[download]

You define your $dummy within the eval{}, therefore it's invisible after eval finishes.
Regards,
svenXY