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requestFrom() = 19
0h: 37
1h: 38
2h: 0
3h: 1
4h: 1
5h: 1
6h: 0
7h: 0
8h: 0
9h: 0
Ah: 0
Bh: 0
Ch: 0
Dh: 0
Eh: 28
Fh: 136
10h: 0
11h: 21
12h: 192

#include <Wire.h>

#define DS3231_I2C_ADDRESS   0x68

///////////  годинник  //////////

byte second, minute, hour, dayOfWeek, dayOfMonth, month, year;

byte decToBcd(byte val)
{
  return ((val / 10 * 16) + (val % 10));
}

byte bcdToDec(byte val)
{
  return ((val / 16 * 10) + (val % 16));
}

void setDateDs3231(byte second,        // 0-59
                   byte minute,        // 0-59
                   byte hour,          // 1-23
                   byte dayOfWeek,     // 1-7
                   byte dayOfMonth,    // 1-28/29/30/31
                   byte month,         // 1-12
                   byte year)          // 0-99
{
  Wire.beginTransmission(DS3231_I2C_ADDRESS);
  Wire.write(0);
  Wire.write(decToBcd(second));
  Wire.write(decToBcd(minute));
  Wire.write(decToBcd(hour));
  Wire.write(decToBcd(dayOfWeek));
  Wire.write(decToBcd(dayOfMonth));
  Wire.write(decToBcd(month));
  Wire.write(decToBcd(year));
  Wire.endTransmission();
}

void getDateDs3231(byte *second,
                   byte *minute,
                   byte *hour,
                   byte *dayOfWeek,
                   byte *dayOfMonth,
                   byte *month,
                   byte *year)
{

  Wire.beginTransmission(DS3231_I2C_ADDRESS);
  Wire.write(0);
  Wire.endTransmission();

  Wire.requestFrom(DS3231_I2C_ADDRESS, 7);

  *second     = bcdToDec(Wire.read() & 0x7f);
  *minute     = bcdToDec(Wire.read());
  *hour       = bcdToDec(Wire.read() & 0x3f);
  *dayOfWeek  = bcdToDec(Wire.read());
  *dayOfMonth = bcdToDec(Wire.read());
  *month      = bcdToDec(Wire.read());
  *year       = bcdToDec(Wire.read());
}

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

  Wire.begin();
}

void loop()
{
  getDateDs3231(&second, &minute, &hour, &dayOfWeek, &dayOfMonth, &month, &year);

  Serial.print(year);
  Serial.print("-");
  Serial.print(hour);
  Serial.print(':');
  Serial.print(minute);
  Serial.print(':');
  Serial.println(second);
}