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chomp($value = <STDIN>); 
if ($value =~ m#(0[1-9]|[12][0-9]|3[01])[-/.](0[1-9]|1[012])[- /.](\d\
+d\d\d)#) { 
...
} else { 
    print $value; print "not a date"; 
}

se DateTime::Format::Strptime;

...
} else {
    print "not a date\n";
}