Clock with Arduino

Arduino clock, easy to set up, you can set the date and time by the Serial monitor, this projects uses few components only jumpers, Arduino, and display Nokia 5110/3110, and ready

// pin 3 - Serial clock out (SCLK)

// pin 4 - Serial date out (DIN)

// pin 5 - date/Command select (D/C)

// pin 6 - LCD chip select (CS/CE)

// pin 7 - LCD reset (RST)

//Programa : Teste display Nokia 5110 usando biblioteca Adafruit 
//Autor : VINICIUS LOPES 
#include <Adafruit_GFX.h> 
#include <Adafruit_PCD8544.h> 
// pin 3 - Serial clock out (SCLK) 
// pin 4 - Serial date out (DIN) 
// pin 5 - date/Command select (D/C) 
// pin 6 - LCD chip select (CS/CE) 
// pin 7 - LCD reset (RST) 
Adafruit_PCD8544 display = Adafruit_PCD8544(3,4,5,6,7); 
int second,minute, hour, day, mounth,year;  
unsigned long UtlTime;  
void setup()  
pinMode(2,OUTPUT); 
UtlTime=0;   {    
minute=0;    
hour=0;    
day=0;    
mounth=0;    
year=0;    
Serial.begin(9600);    
 display.begin(); 
 display.setContrast(50); // Adjust the display contrast 
 display.clearDisplay();   //Apaga o buffer e o display 
 display.setTextSize(1);  //Seta o tamanho do texto 
 display.setTextColor(BLACK); //Seta a cor do texto       
display.print(" date e hour ");    
display.setCursor(0,10);    
display.print(" com Arduino");    
display.display(); 
delay (5000);  
//Configura o minute    
display.clearDisplay();    
display.setCursor(0,0);    
display.print("minute: "); 
display.display(); 
Serial.print("\nin between minute:");   
while(minute==0)   {      
if (Serial.available() > 0)      
{        
minute= Serial.parseInt();      
}    
}    
display.print(minute);    
display.display(); 
delay(1000);  
//Configura a hour    
display.clearDisplay();    
display.setCursor(0,0);    
display.print("hour: ");    
display.display(); 
Serial.print("\nin between hour:");  
while(hour==0)    
{      
if (Serial.available() > 0)      
{        
hour= Serial.parseInt();      
}    
}    
display.print(hour);    
display.display(); 
delay(1000);     
//Configura o day    
display.clearDisplay();    
display.setCursor(0,0);    
display.print("day: "); 
display.display();    
Serial.print("\nin between day:");    
while(day==0)    
{      
if (Serial.available() > 0)      
{        
day= Serial.parseInt();      
}    
}    
display.print(day);    
display.display(); 
delay(1000);     
//Configura o mês    
display.clearDisplay();    
display.setCursor(0,0);    
display.print("mounth: ");  
display.display();   
Serial.print("\nin between mounth:");   
while(mounth==0)    
{      
if (Serial.available() > 0)      
{        
mounth= Serial.parseInt();      
}    
}    
display.print(mounth);   
display.display(); 
delay(1000);     
//Configura o year    
display.clearDisplay();    
display.setCursor(0,0);    
display.print("year: ");    
display.display(); 
Serial.print("\nin between year:");    
while(year==0)    
{      
if (Serial.available() > 0)      
{        
year= Serial.parseInt();      
}    
}    
display.print(year);    
display.display();    
delay(1000); 
display.clearDisplay();  
}  
void loop()  
{    
if(millis()-UtlTime<0)    
{      
UtlTime=millis();    
}    
else    
{      
second=int((millis()-UtlTime)/1000);    
}    
if(second>59)    
{      
second=0;      
minute++;      
UtlTime=millis();      
if(minute>59)      
{        
hour++;        
minute=0;        
if(hour>23)        
{          
day++;          
hour=0;          
if(mounth==1||mounth==3||mounth==5||mounth==7||mounth==8||mounth==10||mounth==12)          
{            
if(day>31)            
{              
day=1;              
mounth++;              
if(mounth>12)              
{                
year++;                
mounth=1;              
}            
}          
}          
else if(mounth==2)          
{            
if(year%400==0)            
{              
if(day>29)              
{                
day=1;                
mounth++;              
}            
}            
else if((year%4==0)&&(year%100!=0))            
{              
if(day>29)              
{               
day=1;                
mounth++;              
}            
}            
else            
{              
if(day>28)              
{                
day=1;                
mounth++;              
}            
}          
}          
else          
{            
if(day>30)            
{              
day=1;              
mounth++;            
}          
}        
}      
}    
}     
display.clearDisplay();  
delay(1000);  
Serial.print(day);    
Serial.print("/");    
Serial.print(mounth);    
Serial.print("/");    
Serial.print(year);    
Serial.println();       
display.setCursor(0,0);    
display.print("date ");    
display.print(day);    
display.print("/");    
display.print(mounth);    
display.print("/");    
display.print(year); 
display.display(); 
Serial.print(hour);    
Serial.print(":");    
Serial.print(minute);    
Serial.print(":");    
Serial.print(second);    
Serial.print("\n");    
Serial.println();       
display.setCursor(0,10);    
display.print("hour ");    
display.print(hour);    
display.print(":");    
display.print(minute);    
display.print(":");    
display.print(second);  
display.display(); 
char tecla; 
tecla = Serial.read(); 
if(tecla=='1'){ 
digitalWrite(2,LOW); 
} 
if(tecla=='2'){ 
 digitalWrite(2, HIGH); 
} 
}