Read SDX time from CC65

void timedate(TimeDate *td)
{
  struct regs r;
  assert(td!=NULL);
  r.pc = 0x703; // KERNEL
  r.y = 100;    // GETTD
  _sys(&r);     // Do Kernel Call.

  td->day     = *(byte*) 0x77B;
  td->month   = *(byte*) 0x77C;
  td->year    = *(byte*) 0x77D;
  td->hours   = *(byte*) 0x77E;
  td->minutes = *(byte*) 0x77F;
  td->seconds = *(byte*) 0x780;

  return;
}