Sample

// Date and time functions using a DS1307 RTC connected via I2C and Wire lib
#include <Wire.h>
#include "RTClib.h"

RTC_DS1307 rtc;
const int LED_1 = 13;     //LED row 1
const int LED_2 = 12;     //LED row 2
const int LED_3 = 11;     //LED row 3
const int LED_4 = 10;     //LED row 4
const int LED_5 = 9;      //LED row 5
const int LED_6 = 8;      //LED row 6
const int LED_7 = 7;      //LED row 7
const int LED_8 = 6;      //LED row 8
const int LED_9 = 5;      //LED row 9
const int LED_10 = 4;     //LED row 10
const int LED_11 = 3;     //LED row 11
void setup ()
{
  Serial.begin(57600);
  Wire.begin();

  rtc.begin();

//  Check to see if rtc is running
  if (! rtc.isrunning() ){
    Serial.println("RTC is NOT running!");
  }
  //Set the date and time
  rtc.adjust(DateTime(2016,10,23,20,37,00) );

    }

  void loop () {

    //Get the date and time
      DateTime now = rtc.now();

     //Print out the date and time to the serial line
      Serial.print(now.year(),DEC);
      Serial.print('/');
      Serial.print(now.month(), DEC);
      Serial.print('/');
      Serial.print(now.day(), DEC);
      Serial.print('/');
      Serial.print(now.hour(), DEC);
      Serial.print('/');
      Serial.print(now.minute(), DEC);
      Serial.print('/');
      Serial.print(now.second(), DEC);
      Serial.println();

      //Check to see if it is time to light the LED or to turn it off.
        if (now.hour() == 00)
        {
         //turn on LED L1(MIDNIGHT)
           pinMode(LED_6, OUTPUT);     //row 1
           digitalWrite(LED_6, HIGH);
           pinMode(LED_7, OUTPUT);     //row 1
           digitalWrite(LED_7, LOW);
           pinMode(LED_8, OUTPUT);     //row 2
           digitalWrite(LED_8, HIGH);
           pinMode(LED_9, INPUT);      //row 3
           digitalWrite(LED_9, LOW);
           pinMode(LED_10, INPUT);      //row 4
           digitalWrite(LED_10, LOW);
        }
          if (now.hour() == 01|13)
         {
          //turn on LED L1(ONE)
           pinMode(LED_6, OUTPUT);     //row 1
           digitalWrite(LED_6, HIGH);
           pinMode(LED_7, OUTPUT);     //row 1
           digitalWrite(LED_7, HIGH);
           pinMode(LED_8, INPUT);     //row 2
           digitalWrite(LED_8, LOW);
           pinMode(LED_9, INPUT);      //row 3
           digitalWrite(LED_9, LOW);
           pinMode(3, OUTPUT);      //row 4
           digitalWrite(3, LOW);
         }
         if (now.hour() == 02||14)
         {
           //turn on LED L2(TWO)
            pinMode(LED_6, OUTPUT);     //row 1
           digitalWrite(LED_6, HIGH);
           pinMode(LED_7, INPUT);     //row 1
           digitalWrite(LED_7, LOW);
           pinMode(LED_8, OUTPUT);     //row 2
           digitalWrite(LED_8,HIGH);
           pinMode(LED_9, INPUT);      //row 3
           digitalWrite(LED_9, LOW);
           pinMode(LED_10, OUTPUT);      //row 4
           digitalWrite(LED_10, LOW);
         }
          if (now.hour() == 03|15)
         {
          //turn on LED L3(THREE)
           pinMode(LED_6, OUTPUT);     //row 1
           digitalWrite(LED_6, HIGH);
           pinMode(LED_7, INPUT);     //row 1
           digitalWrite(LED_7, LOW);
           pinMode(LED_8, INPUT);     //row 2
           digitalWrite(LED_8,LOW);
           pinMode(LED_9, OUTPUT);      //row 3
           digitalWrite(LED_9, LOW);
           pinMode(LED_10, OUTPUT);      //row 4
           digitalWrite(LED_10, HIGH);
         }
          if (now.hour() == 04|16)
         {
          //turn on LED L3(four)
           pinMode(LED_6, OUTPUT);     //row 1
           digitalWrite(LED_6, HIGH);
           pinMode(LED_11, OUTPUT);     //row 1
           digitalWrite(LED_11, HIGH);

         }
           if (now.hour() == 05|17)
         {
          //turn on LED L3(FIVE)
           pinMode(LED_6, OUTPUT);     //row 1
           digitalWrite(LED_6, HIGH);
           pinMode(LED_7, OUTPUT);     //row 1
           digitalWrite(LED_7, HIGH);
           pinMode(LED_8, INPUT);     //row 2
           digitalWrite(LED_8, LOW);
           pinMode(LED_9, OUTPUT);      //row 3
           digitalWrite(LED_9, LOW);
           pinMode(LED_10, INPUT);      //row 4
           digitalWrite(LED_10, LOW);
         }
          if (now.hour() == 06|18)
         {
          //turn on LED L3(SIX)
           pinMode(LED_6, OUTPUT);     //row 1
           digitalWrite(LED_6, HIGH);
           pinMode(LED_7, OUTPUT);     //row 1
           digitalWrite(LED_7, LOW);
           pinMode(LED_8, INPUT);     //row 2
           digitalWrite(LED_8, LOW);
           pinMode(LED_9, INPUT);      //row 3
           digitalWrite(LED_9, LOW);
           pinMode(LED_10, OUTPUT);      //row 4
           digitalWrite(LED_10, HIGH);
         }
          if (now.hour() == 07|19)
         {
          //turn on LED L3(SEVEN)
           pinMode(LED_6, OUTPUT);     //row 1
           digitalWrite(LED_6, HIGH);
           pinMode(LED_7, OUTPUT);     //row 1
           digitalWrite(LED_7, HIGH);
           pinMode(LED_8, OUTPUT);     //row 2
           digitalWrite(LED_8, LOW);
           pinMode(LED_9, INPUT);      //row 3
           digitalWrite(LED_9, LOW);
           pinMode(LED_10, INPUT);      //row 4
           digitalWrite(LED_10, LOW);
         }
          if (now.hour() == 8|20)
         {
           //turn on LED L3(EIGHT)
           pinMode(LED_6, OUTPUT);     //row 1
           digitalWrite(LED_6, HIGH);
           pinMode(LED_7, INPUT);     //row 1
           digitalWrite(LED_7, LOW);
           pinMode(LED_8, INPUT);     //row 2
           digitalWrite(LED_8,LOW);
           pinMode(LED_9, OUTPUT);      //row 3
           digitalWrite(LED_9, HIGH);
           pinMode(LED_10, OUTPUT);      //row 4
           digitalWrite(LED_10, LOW);
         }
           if (now.hour() == 9|21)
         {
          //turn on LED L3(NINE)
           pinMode(LED_6, OUTPUT);     //row 1
           digitalWrite(LED_6, HIGH);
           pinMode(LED_7, INPUT);     //row 1
           digitalWrite(LED_7, LOW);
           pinMode(LED_8, OUTPUT);     //row 2
           digitalWrite(LED_8,LOW);
           pinMode(LED_9, INPUT);      //row 3
           digitalWrite(LED_9, LOW);
           pinMode(LED_10, OUTPUT);      //row 4
           digitalWrite(LED_10, HIGH);
         }
          if (now.hour() == 10|22)
         {
          //turn on LED L3(TEN)
           pinMode(LED_6, OUTPUT);     //row 1
           digitalWrite(LED_6, HIGH);
           pinMode(LED_7, INPUT);     //row 1
           digitalWrite(LED_7, LOW);
           pinMode(LED_8, OUTPUT);     //row 2
           digitalWrite(LED_8, LOW);
           pinMode(LED_9, OUTPUT);      //row 3
           digitalWrite(LED_9, HIGH);
           pinMode(LED_10, INPUT);      //row 4
           digitalWrite(LED_10, LOW);
         }
          if (now.hour() == 11|23)
         {

           //turn on LED L3(ELEVEN)
           pinMode(LED_6, OUTPUT);     //row 1
           digitalWrite(LED_6, HIGH);
           pinMode(LED_7, OUTPUT);     //row 1
           digitalWrite(LED_7, LOW);
           pinMode(LED_8, INPUT);     //row 2
           digitalWrite(LED_8, LOW);
           pinMode(LED_9, OUTPUT);      //row 3
           digitalWrite(LED_9, HIGH);
           pinMode(LED_10, INPUT);      //row 4
           digitalWrite(LED_10, LOW);
         }
          if (now.hour() == 12)
         {
          //turn on LED L3(TWELVE)
           pinMode(LED_6, OUTPUT);     //row 1
           digitalWrite(LED_6, HIGH);
           pinMode(LED_7, INPUT);     //row 1
           digitalWrite(LED_7, LOW);
           pinMode(LED_8, OUTPUT);     //row 2
           digitalWrite(LED_8, HIGH);
           pinMode(LED_9, OUTPUT);      //row 3
           digitalWrite(LED_9, LOW);
           pinMode(LED_10, INPUT);      //row 4
           digitalWrite(LED_10, LOW);
         }
         if (now.minute() > 2 && now.minute() <8 |now.minute() > 52 && now.minute () < 58)
         {
          //turn on LED L1(FIVE)
           pinMode(LED_1,INPUT);     //row 1
           digitalWrite(LED_1, LOW);
           pinMode(LED_2, OUTPUT);     //row 2
           digitalWrite(LED_2,HIGH);
           pinMode(LED_3, OUTPUT);      //row 3
           digitalWrite(LED_3, LOW);
         }
         if (now.minute() > 7 && now.minute() <13 |now.minute() > 47 && now.minute () < 53)
          {
           //turn on LED L1(TEN)
          pinMode(LED_1, OUTPUT);     //row 1
          digitalWrite(LED_1, LOW);
          pinMode(LED_2, INPUT);     //row 2
          digitalWrite(LED_2, LOW);
          pinMode(LED_3, OUTPUT);      //row 3
          digitalWrite(LED_3, HIGH);
         }
        if (now.minute() > 12 && now.minute() <18 |now.minute() > 42 && now.minute () < 48)
         {
          //turn on LED L1(QUARTER)
           pinMode(LED_1,OUTPUT);     //row 1
           digitalWrite(LED_1, LOW);
           pinMode(LED_2, OUTPUT);     //row 2
           digitalWrite(LED_2,HIGH);
           pinMode(LED_3, INPUT);      //row 3
           digitalWrite(LED_3, LOW);
         }
         if (now.minute() > 2 && now.minute() <8 |now.minute() > 52 && now.minute () < 58)
         {
          //turn on LED L1(FIVE)
           pinMode(LED_1,INPUT);     //row 1
           digitalWrite(LED_1, LOW);
           pinMode(LED_2, OUTPUT);     //row 2
           digitalWrite(LED_2,HIGH);
           pinMode(LED_3, OUTPUT);      //row 3
           digitalWrite(LED_3, LOW);
         }
         if (now.minute() > 7 && now.minute() <13 |now.minute() > 47 && now.minute () < 53)
         {
           //turn on LED L1(TEN)
          pinMode(LED_1, OUTPUT);     //row 1
          digitalWrite(LED_1, LOW);
          pinMode(LED_2, INPUT);     //row 2
          digitalWrite(LED_2, LOW);
          pinMode(LED_3, OUTPUT);      //row 3
          digitalWrite(LED_3, HIGH);
         }
         if (now.minute() > 17 && now.minute() <23 |now.minute() > 37 && now.minute () < 43)
         {
           //turn on LED L1(TWENTY)
         pinMode(LED_1, OUTPUT);     //row 1
         digitalWrite(LED_1, HIGH);
         pinMode(LED_2, INPUT);     //row 2
         digitalWrite(LED_2, LOW);
         pinMode(LED_3, OUTPUT);      //row 3
         digitalWrite(LED_3, LOW);
         }
         if (now.minute() > 22 && now.minute() <28 |now.minute() > 32 && now.minute () < 38)
         {
           //turn on LED L1(TWENTYFIVE)
         pinMode(LED_1, INPUT);     //row 1
         digitalWrite(LED_1, LOW);
         pinMode(LED_2, OUTPUT);     //row 2
         digitalWrite(LED_2, LOW);
         pinMode(LED_3, OUTPUT);      //row 3
         digitalWrite(LED_3, HIGH);
         }
         if (now.minute() > 27 && now.minute() <33)
         {
          //turn on LED L1(HALF)
         pinMode(LED_1, OUTPUT);     //row 1
         digitalWrite(LED_1, LOW);
         pinMode(LED_2, OUTPUT);     //row 2
         digitalWrite(LED_2, HIGH);
         pinMode(LED_3, INPUT);      //row 3
         digitalWrite(LED_3, LOW);
         }
         if (now.minute() > 2 && now.minute () <38)
         {

          //turn on LED L1(PAST)
        pinMode(LED_4, OUTPUT);     //row 1
        digitalWrite(LED_4, HIGH);
        pinMode(LED_5, OUTPUT);     //row 2
        digitalWrite(LED_5, LOW);
         }
         if (now.minute() > 32 && now.minute () <58)
         {

          //turn on LED L1(PAST)
        pinMode(LED_4, OUTPUT);     //row 1
        digitalWrite(LED_4, LOW);
        pinMode(LED_5, OUTPUT);     //row 2
        digitalWrite(LED_5, HIGH);
         }
      Serial.println();
      delay(1000);

  }