#include <LiquidCrystal_I2C.h>
#define Btn 11
String time;
 struct Time {
      int hour;
      int minute;
      int sec;
    };
    Time getTime;
boolean flagClear = true;
boolean flagBtn;
boolean Butflag;

class Clock{
  public:
     Clock(int hour,int minute,int sec = 0){
      
      Time.hour = hour;
      Time.minute = minute;
      Time.sec = sec;
      _tmr = millis();
    }

    void setTime(int hour,int minute,int sec = 0){
      
      Time.hour = hour;
      Time.minute = minute;
      Time.sec = sec;
      _tmr = millis();
    }
     Time getTime(){
      return Time;
     }
      void tick(){
        if(millis()-_tmr>=1000){
          _tmr = millis();
          Time.sec++;
          if(Time.sec>=60){
            Time.sec=0;
            Time.minute++;

          }
          if(Time.minute>=60){
            Time.minute = 0;
            Time.hour++;
          }
          
          if(Time.hour>=24){
            Time.hour = 0;
          }
          
        }
      }

  private:
    Time Time;
    unsigned long _tmr;
};


LiquidCrystal_I2C lcd(0x27, 16, 2);
Clock clock(23,59,55);

void setup() {
  pinMode(Btn, INPUT_PULLUP);
  lcd.init();           // инициализация
  lcd.backlight();      // включить подсветку  
  lcd.setCursor(1, 0);
  lcd.clear();
  Serial.begin(115200);
}

void loop() {
  if(digitalRead(Btn)==0&Butflag==0){
    flagBtn = 1;
    Butflag = 1;
    clock.setTime(23,59,55);
    Serial.println("Click");
  }
  if(Butflag)Butflag=0;
  if(flagBtn==1){
  clock.tick();
  getTime = clock.getTime();

  time = String("Time: ")+getTime.hour+":"+getTime.minute+":"+getTime.sec;
  lcd.setCursor(1,0);
  lcd.print(time);
  if(getTime.sec==0&flagClear==true){
    lcd.clear();
    flagClear=false;
  }else if(getTime.sec==1)flagClear = true;
  
  }

}