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This is an arduino sample code for KC868-ASR , auto control relay ON/OFF by date and time. for example ,the demo is every year 4-26 (April 26th) relay will ON, every year 5-2 (May 2nd) relay will OFF. it support command by serial port (USB cable) to send date/time and read date/time.
[attachment=5148]

Code:
#include <DS3231.h>

#include <Wire.h>

String serial_cmd_rcv = ""; //serial port receiver

typedef struct

{

  byte year;// Last two digits of the year, lib will add 2000.

  byte month;

  byte day;

  byte hour ;

  byte minute ;

  byte second ;

}MY_DATE_STR;

MY_DATE_STR my_date_str = {0};

#define OPEN_RLY_DATA   26

#define OPEN_RLY_MONTH  4

#define CLOSE_RLY_DATA   2

#define CLOSE_RLY_MONTH   5

#define SDA_PIN   26

#define SCL_PIN   27

#define RLY1_PIN  19

#define RLY2_PIN  5

DS3231  rtc; 

bool h12Flag;

bool pmFlag;

static bool bCentury = false;

static bool old_level_high = false;

static bool old_level_low = false;

static bool CompareOpenDate()

{

  return (rtc.getDate()==OPEN_RLY_DATA)&(rtc.getMonth(bCentury)==OPEN_RLY_MONTH);

}

static bool CompareCloseDate()

{

  return (rtc.getDate()==CLOSE_RLY_DATA)&(rtc.getMonth(bCentury)==CLOSE_RLY_MONTH);

}

static void PrintfCurTime()

{

  Serial.print("current time is: ");

  int year = rtc.getYear() + 2000;

  Serial.print(year);

  Serial.print("-");

  Serial.print(rtc.getMonth(bCentury), DEC);

  Serial.print("-");

  // then the date

  Serial.print(rtc.getDate(), DEC);

  Serial.print(" ");

  // and the day of the week

  //Serial.print(rtc.getDoW(), DEC);

  //Serial.print(" ");

  // Finally the hour, minute, and second

  Serial.print(rtc.getHour(h12Flag, pmFlag), DEC);

  Serial.print(":");

  Serial.print(rtc.getMinute(), DEC);

  Serial.print(":");

  Serial.println(rtc.getSecond(), DEC);

}

static void GetSerialCmd() 

{ ////format:D2024-04-28T11:50:22

  /*while (Serial.available() > 0)

  {

    serial_cmd_rcv += char(Serial.read());

    delay(5);  

  } */

  if(Serial.available() > 0)

  {

    delay(100);

    int num_read = Serial.available();

    while(num_read--)

      serial_cmd_rcv += char(Serial.read());

  }

  else return;

  serial_cmd_rcv.trim();

  if(serial_cmd_rcv == "current time")

  {

    PrintfCurTime();

    serial_cmd_rcv = "";

    return;

  }

  Serial.print("rcv length:");

  Serial.println(serial_cmd_rcv.length());

  int indexof_d = serial_cmd_rcv.indexOf('D');

  int indexof_t = serial_cmd_rcv.indexOf('T');

  Serial.print("d index:");Serial.print(indexof_d);

  Serial.print(" t index:");Serial.println(indexof_t);

  if (serial_cmd_rcv.length() != 20 || 

      serial_cmd_rcv.substring(0,1) != "D" ||

      serial_cmd_rcv.substring(11,12) != "T")  

  {

    Serial.println(serial_cmd_rcv);

    serial_cmd_rcv="";

    return;

    }

  Serial.println("setting is start!");

  my_date_str.year = (byte)serial_cmd_rcv.substring(3,5).toInt();

  my_date_str.month = (byte)serial_cmd_rcv.substring(6,8).toInt();

  my_date_str.day = (byte)serial_cmd_rcv.substring(9,11).toInt();

  my_date_str.hour = (byte)serial_cmd_rcv.substring(12,14).toInt();

  my_date_str.minute = (byte)serial_cmd_rcv.substring(15,17).toInt();

  my_date_str.second = (byte)serial_cmd_rcv.substring(18).toInt();

  rtc.setYear(my_date_str.year);

  rtc.setMonth(my_date_str.month);

  rtc.setDate(my_date_str.day);

  rtc.setHour(my_date_str.hour);

  rtc.setMinute(my_date_str.minute);

  rtc.setSecond(my_date_str.second);

  serial_cmd_rcv = ""; 

  Serial.println("setting is ending!");

}

static bool GetEdgeP(bool cur,bool old)  {return (cur & !old);}

static bool bOpen,bClose;

void setup() {

  // put your setup code here, to run once:

  // Start the I2C interface

  Wire.begin(SDA_PIN,SCL_PIN,40000);

  // Setup Serial connection

  Serial.begin(115200);

  pinMode(RLY1_PIN,OUTPUT);

  pinMode(RLY2_PIN,OUTPUT);

  // Set 12/24h mode. True is 12-h, false is 24-hour.

  rtc.setClockMode(false);////24h

  PrintfCurTime();

  while(Serial.read()>=0){}

}

void loop() {

  // put your main code here, to run repeatedly:

  GetSerialCmd();

  bOpen = CompareOpenDate();

  bClose = CompareCloseDate();

  if(GetEdgeP(bOpen,old_level_high)) digitalWrite(RLY1_PIN,HIGH);

  if(GetEdgeP(bClose,old_level_low)) digitalWrite(RLY1_PIN,LOW);

  old_level_high = bOpen;

  old_level_low = bClose;

  //delay (1000);

}

source code download ZIP file: [attachment=5144]
before use code need install DS3231 arduino library firstly.
[attachment=5145]
download firmware by arduino IDE:
[attachment=5146]
serial port by USB 115200bps
set date and time command example: D2024-04-28T11:50:22
print current date and time: current time
[attachment=5147]
[attachment=5149]

because it's not easy to battery by air plane, so if you want timer work when power off, you can install the CR1220 on KC868-ASR PCB bottom side.
[attachment=5150]
[attachment=5151]

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