code: private static void writeZonePropsByTime(Writer writer, boolean isDst, String tzname,
              int fromOffset, int toOffset, long time, boolean withRDATE) throws IOException {
          beginZoneProps(writer, isDst, tzname, fromOffset, toOffset, time);
          if (withRDATE) {
              writer.write(ICAL_RDATE);
              writer.write(COLON);
              writer.write(getDateTimeString(time + fromOffset));
              writer.write(NEWLINE);
          }
          endZoneProps(writer, isDst);
      }
docs: /*
  Write a single start time