packet = bytearray(0x30)

  if timezone < 0:
    packet[0x08] = 0xff + timezone - 1
    packet[0x09] = 0xff
    packet[0x0a] = 0xff
    packet[0x0b] = 0xff
  else:
    packet[0x08] = timezone
    packet[0x09] = 0
    packet[0x0a] = 0
    packet[0x0b] = 0
  packet[0x0c] = year & 0xff
  packet[0x0d] = year >> 8
  packet[0x0e] = datetime.now().minute
  packet[0x0f] = datetime.now().hour
  subyear = str(year)[2:]
  packet[0x10] = int(subyear)
  packet[0x11] = datetime.now().isoweekday()
  packet[0x12] = datetime.now().day
  packet[0x13] = datetime.now().month
  packet[0x18] = int(address[0])
  packet[0x19] = int(address[1])
  packet[0x1a] = int(address[2])
  packet[0x1b] = int(address[3])
  packet[0x1c] = port & 0xff
  packet[0x1d] = port >> 8
  packet[0x26] = 6
  checksum = 0xbeaf