Clock

This will do:

// Project 58 - Creating a Simple Digital Clock
#include "Wire.h"
#define DS3232_I2C_ADDRESS 0x68
#include <LiquidCrystal.h>
LiquidCrystal lcd( 8, 9, 4, 5, 6, 7 );
// Convert normal decimal numbers to binary coded decimal
byte decToBcd(byte val)
{
  return( (val/10*16) + (val%10) );
}
// Convert binary coded decimal to normal decimal numbers
byte bcdToDec(byte val)
{
  return( (val/16*10) + (val%16) );
}
void setup()
{
  Wire.begin();
  lcd.begin(16, 2);
  // set the initial time here:
  // DS3232 seconds, minutes, hours, day, date, month, year
  //setDS3232time(0, 27, 0, 5, 15, 11, 12);
}
void setDS3232time(byte second, byte minute, byte hour, byte dayOfWeek, byte
dayOfMonth, byte month, byte year)
{
  // sets time and date data to DS3232
  Wire.beginTransmission(DS3232_I2C_ADDRESS);
  Wire.write(0); // set next input to start at the seconds register
  Wire.write(decToBcd(second)); // set seconds
  Wire.write(decToBcd(minute)); // set minutes
  Wire.write(decToBcd(hour)); // set hours
  Wire.write(decToBcd(dayOfWeek)); // set day of week (1=Sunday, 7=Saturday)
  Wire.write(decToBcd(dayOfMonth)); // set date (1 to 31)
  Wire.write(decToBcd(month)); // set month
  Wire.write(decToBcd(year)); // set year (0 to 99)
  Wire.endTransmission();
}
void readDS3232time(byte *second,
byte *minute,
byte *hour,
byte *dayOfWeek,
byte *dayOfMonth,
byte *month,
byte *year)
{
  Wire.beginTransmission(DS3232_I2C_ADDRESS);
  Wire.write(0); // set DS3232 register pointer to 00h
  Wire.endTransmission();
  Wire.requestFrom(DS3232_I2C_ADDRESS, 7);
  // request seven bytes of data from DS3232 starting from register 00h
  *second = bcdToDec(Wire.read() & 0x7f);
  *minute = bcdToDec(Wire.read());
  *hour = bcdToDec(Wire.read() & 0x3f);
  *dayOfWeek = bcdToDec(Wire.read());
  *dayOfMonth = bcdToDec(Wire.read());
  *month = bcdToDec(Wire.read());
  *year = bcdToDec(Wire.read());
}
void displayTime()
{
  byte second, minute, hour, dayOfWeek, dayOfMonth, month, year;
  // retrieve data from DS3232
  readDS3232time(&second, &minute, &hour, &dayOfWeek, &dayOfMonth, &month,
  &year);
  // send the data to the LCD shield
  lcd.clear();
  lcd.setCursor(4,0);
  lcd.print(hour, DEC);
  lcd.print(":");
  if (minute<10)
  {
    lcd.print("0");
  }
  lcd.print(minute, DEC);
  lcd.print(":");
  if (second<10)
  {
    lcd.print("0");
  }
  lcd.print(second, DEC);
  lcd.setCursor(0,1);
  switch(dayOfWeek){
  case 1:
    lcd.print("Sun");
    break;
  case 2:
    lcd.print("Mon");
    break;
  case 3:
    lcd.print("Tue");
    break;
  case 4:
    lcd.print("Wed");
    break;
  case 5:
    lcd.print("Thu");
    break;
  case 6:
    lcd.print("Fri");
    break;
  case 7:
    lcd.print("Sat");
    break;
  }
  lcd.print(" ");
  lcd.print(dayOfMonth, DEC);
  lcd.print("/");
  lcd.print(month, DEC);
  lcd.print("/");
  lcd.print(year, DEC);
}
void loop()
{
  displayTime(); // display the real-time clock time on the LCD,
  delay(1000); // every second
}