Set Time with DS3231 RTC-Arduino - VTM Systems Store

/*
 * VTM Arduino Tutorial: Set Time on DS3231 RTC (Standard C++)
 * Tutorial: Set Time with DS3231 RTC - Arduino IDE
 * 
 * Hardware Connections:
 *   DS3231 VCC -> Arduino 5V
 *   DS3231 GND -> Arduino GND
 *   DS3231 SDA -> Arduino Pin A4 (Uno) or SDA
 *   DS3231 SCL -> Arduino Pin A5 (Uno) or SCL
 * 
 * Library: RTClib by Adafruit (Install via Arduino IDE Library Manager)
 */

#include <Wire.h>
#include "RTClib.h"

RTC_DS3231 rtc;

void setup() {
  Serial.begin(115200);
  Wire.begin();

  if (!rtc.begin()) {
    Serial.println("Couldn't find DS3231 RTC!");
    while (1);
  }

  // Sets the RTC to the date & time this sketch was compiled
  rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  Serial.println("DS3231 RTC time successfully set to compile time!");
}

void loop() {
  DateTime now = rtc.now();

  Serial.print("Date: ");
  Serial.print(now.year(), DEC);
  Serial.print('/');
  Serial.print(now.month(), DEC);
  Serial.print('/');
  Serial.print(now.day(), DEC);
  Serial.print("  Time: ");
  if (now.hour() < 10) Serial.print('0');
  Serial.print(now.hour(), DEC);
  Serial.print(':');
  if (now.minute() < 10) Serial.print('0');
  Serial.print(now.minute(), DEC);
  Serial.print(':');
  if (now.second() < 10) Serial.print('0');
  Serial.println(now.second(), DEC);

  delay(1000);
}