static int hours() {
  ret hours(java.util.Calendar.getInstance());
}

static int hours(java.util.Calendar c) {
  ret c.get(java.util.Calendar.HOUR_OF_DAY);
}

static int hours(long time) {
  ret hours(calendarFromTime(time));
}

static int hours(long time, TimeZone tz) {
  ret hours(calendarFromTime(time, tz));
}