Cuplikan sketch pake timer

void timerIsr() // interupt timernya
{
    // Toggle LED
    second++;
    //Serial.print(second);
    if(second==60)
    {
      second=0;
      minute++;
    }

    if(minute==60)
    {
      minute=0;
      hour++;
    }

    if(hour==24)
    {
      hour=0;
    }
}


void setup(){
  Timer1.initialize(100000); // set a timer of length 100000 microseconds (or 0.1 sec - or 10Hz => the led will blink 5 times, 5 cycles of on-and-off, per second)
  Timer1.attachInterrupt( timerIsr ); // attach the service routine here
  ............
  ............

}

void loop()
{
          sprintf(buf, "@twistedclever coba kirim tweet# %2d%02d%02d",hour,minute,second);

          sendTweet(buf);
	  delay(1000);


}