my @dates = (
	"1901-01-01 00:00:00",
    "1968-12-31 23:59:59",
    "1969-01-01 00:00:00",
    "1969-12-31 23:59:59",
    "1970-01-01 00:00:01",
);
for my $string (@dates) {
    my $epoch = str2time( $string, 'GMT' );
	print "$string ($epoch seconds)\n";
    my $date = DateTime->from_epoch( epoch => $epoch );
	print $date->ymd, " ", $date->hms, "\n\n";
}