setRTCTime_FirstTime.ino

/*
        _          _ ______ _____ _____ 
       (_)        | |  ____|  __ \_   _|
  _ __  ___  _____| | |__  | |  | || |  
 | '_ \| \ \/ / _ \ |  __| | |  | || |  
 | |_) | |>  <  __/ | |____| |__| || |_ 
 | .__/|_/_/\_\___|_|______|_____/_____|
 | |                                    
 |_|                                    
                             
www.pixeledi.eu | twitter.com/pixeledi
Set RTC Time for the first Time | V1.0 | 06/2022

*/

// Date and time functions using a DS1307 RTC connected via I2C and Wire lib
#include <Wire.h>
#include "RTClib.h"

RTC_DS1307 rtc;

char daysOfTheWeek[7][12] = {"Sunday","Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

void setup () {
  Serial.begin(9600);
  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    while (1);
  }
  //just first time
  //rtc.adjust(DateTime(2022, 5, 27, 15, 46, 0));   // <----------------------SET TIME AND DATE: YYYY,MM,DD,HH,MM,SS
  delay(100);
}

void loop () {
    DateTime now = rtc.now();
    Serial.print(now.day(), DEC);
    Serial.print('/');
    Serial.print(now.month(), DEC);
    Serial.print('/');
    Serial.print(now.year(), DEC);
    Serial.print(" (");
    Serial.print(daysOfTheWeek[now.dayOfTheWeek()]);
    Serial.print(") ");
    Serial.print(now.hour(), DEC);
    Serial.print(':');
    Serial.print(now.minute(), DEC);
    Serial.print(':');
    Serial.print(now.second(), DEC);
    Serial.println();
    
    delay(3000); //Print date and time every 3 sec
}