sub _daygm {
    $_[3] + ($Cheat{pack("ss",@_[4,5])} ||= do {
	my $month = ($_[4] + 10) % 12;
	my $year = $_[5] + 1900 - $month/10;
	365*$year + $year/4 - $year/100 + $year/400 + ($month*306 + 5)/10 - $Epoc
    });
}