Digital Clock

#include <LiquidCrystal.h>
//to change time, hold chanage time button for 1 second, then use hour chnage and minute change buttons.

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
int hour = 12;
int minutes = 0;
int seconds = 0;
int decBtn = 10;
int hrUp = 9;
int hrDwn = 8;
int minUp = 7;
int minDwn = 6;
int hrUpDec = 0;
int hrDwnDec = 0;
int minUpDec = 0;
int minDwnDec = 0;

void setup() {
  lcd.begin(16, 2);
  pinMode(decBtn, INPUT);
  pinMode(hrUp, INPUT);
  pinMode(hrDwn, INPUT);
  pinMode(minUp, INPUT);
  pinMode(minDwn, INPUT);
}

void loop() {
  if (digitalRead(decBtn) == HIGH) {
    if (digitalRead(hrUp) == HIGH && hrUpDec == 0) {
      hrUpDec = 1;
      hour = hour + 1;
    } else if (digitalRead(hrUp) == LOW) {
      hrUpDec = 0;
    }
    if (digitalRead(hrDwn) == HIGH && hrDwnDec == 0) {
      hrDwnDec = 1;
      hour = hour - 1;
    } else if (digitalRead(hrDwn) == LOW) {
      hrDwnDec = 0;
    }
    if (digitalRead(minUp) == HIGH && minUpDec == 0) {
      minUpDec = 1;
      minutes = minutes + 1;
    } else if (digitalRead(minUp) == LOW) {
      minUpDec = 0;
    }
    if (digitalRead(minDwn) == HIGH && minDwnDec == 0) {
      minDwnDec = 1;
      minutes = minutes - 1;
    } else if (digitalRead(minDwn) == LOW) {
      minDwnDec = 0;
    }
    seconds = 0;
    lcd.clear();
    if (minutes == 60) {
      minutes = 0;
      hour = hour + 1;
    }
    if (minutes < 0) {
      minutes = 59;
    }
    if (hour == 13) {
      hour = 1;
    }
    if (hour < 1) {
      hour = 12;
    }
    lcd.print(hour);
    lcd.print(":");
    if (minutes < 10) {
      lcd.print(0);
    }
    lcd.print(minutes);
    delay(20);
  } else if (digitalRead(decBtn) == LOW) {
    lcd.clear();
    if (seconds == 60) {
      seconds = 0;
      minutes = minutes + 1;
    }
    if (minutes == 60) {
      minutes = 0;
      hour = hour + 1;
    }
    if (minutes < 0) {
      minutes = 59;
    }
    if (hour == 13) {
      hour = 1;
    }
    if (hour < 1) {
      hour = 12;
    }
    lcd.print(hour);
    lcd.print(":");
    if (minutes < 10) {
      lcd.print(0);
    }
    lcd.print(minutes);
    delay(1000);
    lcd.clear();
    seconds = seconds + 1;
  }
}