3Pushbuttons + RTC + LCD

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#include <LiquidCrystal_I2C.h>
#include <ThreeWire.h>
#include <RtcDS1302.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);
ThreeWire myWire(11, 13, 12); // DAT, CLK, RST
RtcDS1302<ThreeWire> Rtc(myWire);

// Pushbutton pins
const int btnSet     = 2;//set
const int btnInc     = 3;//increment
const int btnConfirm = 4;//save

enum TimeField { NONE, YEAR, MONTH, DAY, HOUR, MINUTE, SECOND, DONE };
TimeField currentField = NONE;

int year, month, day, hour, minute, second;
bool settingMode = false;

// Long press detection
unsigned long setPressStart = 0;
bool setHeld = false;

// Debounce timing
unsigned long lastIncPress = 0;
unsigned long lastConfirmPress = 0;
const unsigned long debounceDelay = 200;

void setup() {
  lcd.init();
  lcd.backlight();
  Rtc.Begin();

  pinMode(btnSet, INPUT_PULLUP);
  pinMode(btnInc, INPUT_PULLUP);
  pinMode(btnConfirm, INPUT_PULLUP);
}

void loop() {
  if (!settingMode) {
    // Normal display mode
    RtcDateTime now = Rtc.GetDateTime();

    char dateBuffer[11]; // DD/MM/YYYY
    sprintf(dateBuffer, "%02d/%02d/%04d", now.Day(), now.Month(), now.Year());

    char timeBuffer[9]; // HH:MM:SS
    sprintf(timeBuffer, "%02d:%02d:%02d", now.Hour(), now.Minute(), now.Second());

    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Date: ");
    lcd.print(dateBuffer);

    lcd.setCursor(0, 1);
    lcd.print("Time: ");
    lcd.print(timeBuffer);

    // Long press to reset and enter setting mode
    if (digitalRead(btnSet) == LOW) {
      if (!setHeld) {
        setPressStart = millis();
        setHeld = true;
      } else if (millis() - setPressStart > 1000) {
        year = 2000;
        month = 1;
        day = 1;
        hour = 0;
        minute = 0;
        second = 0;
        currentField = YEAR;
        settingMode = true;
        setHeld = false;
        delay(300);
      }
    } else {
      setHeld = false;
    }

    delay(500);
    return;
  }

  // Time setting mode
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Enter ");
  lcd.print(fieldName(currentField));

  lcd.setCursor(0, 1);
  lcd.print("Value: ");
  lcd.print(paddedValue(currentField));

  // Increment field with debounce
  if (digitalRead(btnInc) == LOW && millis() - lastIncPress > debounceDelay) {
    incrementField(currentField);
    lastIncPress = millis();
  }

  // Confirm field with debounce
  if (digitalRead(btnConfirm) == LOW && millis() - lastConfirmPress > debounceDelay) {
    currentField = static_cast<TimeField>(currentField + 1);
    lastConfirmPress = millis();

    if (currentField == DONE) {
      RtcDateTime newTime(year, month, day, hour, minute, second);
      Rtc.SetDateTime(newTime);
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Time Saved!");
      delay(1000);
      settingMode = false;
      currentField = NONE;
    }
  }

  delay(50); // smooth loop
}

String fieldName(TimeField field) {
  switch (field) {
    case YEAR: return "Year";
    case MONTH: return "Month";
    case DAY: return "Day";
    case HOUR: return "Hour";
    case MINUTE: return "Minute";
    case SECOND: return "Second";
    default: return "";
  }
}

String paddedValue(TimeField field) {
  char buffer[5];
  int value = getFieldValue(field);
  if (field == YEAR) {
    sprintf(buffer, "%04d", value);
  } else {
    sprintf(buffer, "%02d", value);
  }
  return String(buffer);
}

int getFieldValue(TimeField field) {
  switch (field) {
    case YEAR: return year;
    case MONTH: return month;
    case DAY: return day;
    case HOUR: return hour;
    case MINUTE: return minute;
    case SECOND: return second;
    default: return 0;
  }
}

void incrementField(TimeField field) {
  switch (field) {
    case YEAR: year++; break;
    case MONTH: month = (month % 12) + 1; break;
    case DAY: day = (day % 31) + 1; break;
    case HOUR: hour = (hour + 1) % 24; break;
    case MINUTE: minute = (minute + 1) % 60; break;
    case SECOND: second = (second + 1) % 60; break;
    default: break;
  }
}