void loop()
{
if (digitalRead(switchPin))
{
adjustTime(1);
}
  updateDisplay();
    delay(1);
}

void updateDisplay()
{
   int clockMinute = minute();
  int clockHour = hourFormat12();
  showHour(clockHour);    // the present hour in 12 hour format)
  showMinute(clockMinute/10,clockHour);  // the present minute (0-59)
}

void showMinute(int m, int r) // inputs are minuteHand and hour
{
  digitalWrite(segmentPins[m], ! symBols[r][m]);
  delay(100);
  digitalWrite(segmentPins[m], symBols[r][m]);
  delay(900);
}

void showHour(int n) // n is hour from 1 to 12
{
  for (int i = 0; i < 7; i++)
  {
    digitalWrite(segmentPins[i], symBols[n][i]);
  }
}