use Date::Parse;
use Date::Manip qw();

sub is_valid_date_string {
    my $str = shift;

    my @elms = strptime($str);

    # Date::Parse will leave undefs if the elem cannot be found in the string
    return 0 unless defined($elms[3]) && defined($elms[4]) && defined($elms[5]);

    my $str_r = sprintf("%4d-%02d-%02d", $elms[5]+1900, $elms[4]+1, $elms[3] );

    # Run back trhough Date::Manip to make sure whatever we parsed is a valid date
    return 0 unless Date::Manip::UnixDate($str_r,"%Y-%m-%d") eq $str_r;
    return 1;
}