Arduino for STM32

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setClockSource(STM32RTC::LSE_CLOCK)

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/*
  SimpleRTC

  This sketch shows how to configure the RTC and to display
  the date and time periodically

  Creation 12 Dec 2017
  by Wi6Labs
  Modified 03 Jul 2020
  by Frederic Pillon for STMicroelectronics

  This example code is in the public domain.

  https://github.com/stm32duino/STM32RTC
*/

#include <STM32RTC.h>

/* Get the rtc object */
STM32RTC& rtc = STM32RTC::getInstance();

/* Change these values to set the current initial time */
const byte seconds = 20;
const byte minutes = 14;
const byte hours = 19;

/* Change these values to set the current initial date */
/* Monday 15th June 2015 */
const byte weekDay = 1;
const byte day = 15;
const byte month = 6;
const byte year = 15;

void setup()
{
  Serial.begin(9600);
  delay(1000);
  // Select RTC clock source: LSI_CLOCK, LSE_CLOCK or HSE_CLOCK.
  // By default the LSI is selected as source.
  Serial.print("RTC Test");
  rtc.setClockSource(STM32RTC::LSE_CLOCK);
  Serial.print("Clcok Set");
  rtc.begin(); // initialize RTC 24H format

  // Set the time
  rtc.setHours(hours);
  rtc.setMinutes(minutes);
  rtc.setSeconds(seconds);

  // Set the date
  rtc.setWeekDay(weekDay);
  rtc.setDay(day);
  rtc.setMonth(month);
  rtc.setYear(year);

  // you can use also
  //rtc.setTime(hours, minutes, seconds);
  //rtc.setDate(weekDay, day, month, year);
}

void loop()
{
  // Print date...
  Serial.printf("%02d/%02d/%02d ", rtc.getDay(), rtc.getMonth(), rtc.getYear());

  // ...and time
  Serial.printf("%02d:%02d:%02d.%03d\n", rtc.getHours(), rtc.getMinutes(), rtc.getSeconds(), rtc.getSubSeconds());

  delay(1000);
}

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 if (!rtc.isTimeSet()) {
    // Set the time
    rtc.setHours(hours);
    rtc.setMinutes(minutes);
    rtc.setSeconds(seconds);
  }