code: void writeTimestamp(DataOutput out)
          throws IOException {
  
          int header = SPX.MOMENT_TYPE;
          header <<= 4;
  
          if (this.isPositiveLS()) {
              header |= 1;
          }
  
          int fp = this.getNanosecond();
  
          if (fp > 0) {
              header |= 2;
          }
  
          out.writeByte(header);
          out.writeLong(this.posixTime);
  
          if (fp > 0) {
              out.writeInt(fp);
          }
  
      }
docs: Serialisierungsmethode.
  
  @param   out         output stream
  @throws  IOException in case of I/O-errors