#include <Wire.h>
#include "RTClib.h"
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,20,4);

RTC_DS1307 DS1307;

char seznamDni[7][8]= {"nedele", "pondeli", "utery", "streda", "ctvrtek", "patek", "sobota"}; //v tom poli je 7 jako počet

void setup() {
  lcd.init();
  lcd.backlight();
  if (! DS1307.begin()) {
    lcd.println("hodiny nejsou pripojeny!");
    for(;;);
  }

  if (! DS1307.isrunning()) {
    lcd.println("hodiny nejsou spusteny! Spoutim nyni");
  }

  //DS1307.adjust(DateTime(2016, 4, 26, 9, 9, 11)); //nastaveni vlastniho datumu
  DS1307.adjust(DateTime(__DATE__,__TIME__));
}

void loop() {
  DateTime datumCas = DS1307.now();
  lcd.setCursor(0,0);
  lcd.print("Aktualni cas: ");
  lcd.setCursor(0,1);

  if (datumCas.hour()+1 <= 9){
  lcd.print("0");
  lcd.print(datumCas.hour()+1);
  } else {
    lcd.print(datumCas.hour()+1);
  }

  lcd.print(':');
  lcd.print(datumCas.minute() <= 9 ? String("0")+ String(datumCas.minute()) : datumCas.minute());
  lcd.print(':');
  lcd.print(datumCas.second() <= 9 ? String("0")+ String(datumCas.second()) : datumCas.second());
  lcd.setCursor(0,2);
  lcd.print(seznamDni[datumCas.dayOfTheWeek()]);
  lcd.print(" ");
  lcd.print(datumCas.day());
  lcd.print('.');
  lcd.print(datumCas.month());
  lcd.print('.');
  lcd.print(datumCas.year());
  delay(1000);
 
}