code: public void writeTimestamp(Timestamp timestamp) throws IOException {
  		_writeArrayFieldNameIfNeeded();
  		_verifyValueWrite("write timestamp");
  		_buffer.putByte(_typeMarker, BsonConstants.TYPE_TIMESTAMP);
  		_buffer.putInt(timestamp.getInc());
  		_buffer.putInt(timestamp.getTime());
  		flushBuffer();
  	}
docs: Write a MongoDB timestamp
  
  @param timestamp The timestamp to write
  @throws IOException If an error occurred in the stream while writing