if (y2 != yact || m2 != mact) {
errln("Fail: " + m + "/" + y +
" -> add(MONTH, " + monthDelta + ") -> " +
mact + "/" + yact + ", expected " +
m2 + "/" + y2);
cal.clear();
cal.set(Calendar.YEAR, y);
cal.set(Calendar.MONTH, m-1);
logln("Start: " + m + "/" + y);
int delta = monthDelta > 0 ? 1 : -1;
for (int c=0; c!=monthDelta; c+=delta) {