sS ymd() {
  ret ymd(now());
}

sS ymd(long now) {
  ret year(now) + formatInt(month(now), 2) + formatInt(dayOfMonth(now), 2);
}

sS ymd(long now, TimeZone tz) {
  ret year(now, tz) + formatInt(month(now, tz), 2) + formatInt(dayOfMonth(now, tz), 2);
}