static java.util.Calendar calendarFromTime(long time, TimeZone tz) {
  java.util.Calendar c = java.util.Calendar.getInstance(tz);
  c.setTimeInMillis(time);
  ret c;
}

static java.util.Calendar calendarFromTime(long time) {
  java.util.Calendar c = java.util.Calendar.getInstance();
  c.setTimeInMillis(time);
  ret c;
}