#include <Wire.h>

#include "Adafruit_LEDBackpack.h"

#include "Adafruit_GFX.h"

#include "RTClib.h"

RTC_DS1307 RTC;

Adafruit_7segment disp = Adafruit_7segment();

void setup() 

{

  Wire.begin();

  RTC.begin();

  if (! RTC.isrunning()) 

  {

    RTC.adjust(DateTime(__DATE__, __TIME__));

  }

  disp.begin(0x70);

}

void loop() 

{

  disp.print(getDecimalTime());

  disp.drawColon(true);

  disp.writeDisplay();

  delay(500);

  disp.drawColon(false);

  disp.writeDisplay();

  delay(500);

}

int getDecimalTime()

{

  DateTime now = RTC.now();

  int decimalTime = now.hour() * 100 + now.minute();

  return decimalTime;

}