arduino rtc example HT1382

#include "WSWire.h"
#define HT1382_ADDRESS 0x68
byte set_second = 0;
byte set_minute = 58;
byte set_hour = 13;
byte set_day = 1;
byte set_date = 2;
byte set_month = 12;
byte set_year = 16;

byte read_second;
byte read_minute;
byte read_hour;
byte read_day;
byte read_date;
byte read_month;
byte read_year;

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

void setup() {
  Serial.begin(9600);
  while (!Serial);
  Serial.println("Init time");
  Wire.begin();
  Wire.beginTransmission(HT1382_ADDRESS);
  Wire.write((byte)0);
  Wire.write(dec_to_bcd(set_second));
  Wire.write(dec_to_bcd(set_minute));
  Wire.write(dec_to_bcd(set_hour));
  Wire.write(dec_to_bcd(set_day));
  Wire.write(dec_to_bcd(set_date));
  Wire.write(dec_to_bcd(set_month));
  Wire.write(dec_to_bcd(set_year));
  int result = Wire.endTransmission();
  Serial.print("Done with result = ");
  Serial.println(result);
}

void loop() {
  Wire.beginTransmission(HT1382_ADDRESS);
  Wire.write((byte)0);
  Wire.endTransmission();
  Wire.requestFrom(HT1382_ADDRESS, 7);
  read_second = bcd_to_Dec(Wire.read());
  read_minute = bcd_to_Dec(Wire.read());
  read_hour = bcd_to_Dec(Wire.read());
  read_day = bcd_to_Dec(Wire.read());
  read_date = bcd_to_Dec(Wire.read());
  read_month = bcd_to_Dec(Wire.read());
  read_year = bcd_to_Dec(Wire.read());
  Serial.println(read_second);
  delay(1000);
}