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Just a couple pics of it running (before adding the dots for a colon) :

And after adding the dots for a colon:

Some test code to count from 0 to 99

int LATCH_PIN = 8;
int CLOCK_PIN = 12;
int DATA_PIN = 11;

//                0      1      2      3      4      5      6      7      8      9
int digits[] = {B0000, B1000, B0100, B1100, B0010, B1010, B0110, B1110, B0001, B1001};

void setup(){

  pinMode(LATCH_PIN, OUTPUT);
  pinMode(CLOCK_PIN, OUTPUT);
  pinMode(DATA_PIN, OUTPUT);

}

void loop(){

  for (int i = 0; i < 10; i++){
  
    for (int j = 0; j < 10; j++){
   
      digitalWrite(LATCH_PIN, LOW);
      shiftOut(DATA_PIN, CLOCK_PIN, LSBFIRST, (digits[i] << 4) + digits[j]);
      digitalWrite(LATCH_PIN, HIGH);
      delay(100);
    
    }
  
  }

} 

 

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