求助DS3231时钟模块该咋用啊

// 网页链接 // Prints a snapshot of the current date and time along with the UNIX time
// Modified by Andy Wickert from the JeeLabs / Ladyada RTC library examples
// 5/15/11
#include <Wire.h>
#include <DS3231.h>
RTClib myRTC;
void setup () {
Serial.begin(57600);
Wire.begin();
delay(500);
Serial.println("Nano Ready!");
}
void loop () {
delay(1000);
DateTime now = myRTC.now();
Serial.print(now.year(), DEC);
Serial.print('/');
Serial.print(now.month(), DEC);
Serial.print('/');
Serial.print(now.day(), DEC);
Serial.print(' ');
Serial.print(now.hour(), DEC);
Serial.print(':');
Serial.print(now.minute(), DEC);
Serial.print(':');
Serial.print(now.second(), DEC);
Serial.println();
Serial.print(" since midnight 1/1/1970 = ");
Serial.print(now.unixtime());
Serial.print("s = ");
Serial.print(now.unixtime() / 86400L);
Serial.println("d");
}

这个问题是不是有点太基础了