#include <LiquidCrystal.h>

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);//rs12, e 11, 2 -d4,3 -d5 4-,d6,5-d7
int sec_=0,min_=0,hour_=0;
long x;

void setup() {
  // set up the LCD's number of columns and rows:
  lcd.begin(20, 4);
  // Print a message to the LCD.
  lcd.print("Digital Clock");
  x=millis();
}

void loop() {
  // set the cursor to column 0, line 1
  // (note: line 1 is the second row, since counting begins with 0):
  lcd.setCursor(0, 3);
  // print the number of seconds since reset:
  if (millis()>(x+1000)){
    x=millis();
    if (sec_<60){
      sec_++;
    }
    else{
      sec_=0;
      if (min_<60){
        min_++;
      }
      else{
        min_=0;
        if (hour_<24){
          hour_++;
        }
        else{
          hour_=0;
        }
      }
    }
  }
  lcd.print(sec_);
  lcd.print(" sec");

lcd.setCursor(0, 2);
  // print the number of seconds since reset:
  lcd.print(min_);
  lcd.print(" min");

lcd.setCursor(0, 1);
  // print the number of seconds since reset:
  lcd.print(hour_);
  lcd.print(" hours");
}