#include <SD.h>
#include "RTClib.h"
#include <Wire.h>
#include <string.h>

RTC_DS1307 RTC;
char filename[] = "00000000.TXT";
char masodik[] = "00000000.TXT";
char dir[] = "asd/";
File myFile;

char data[100];
char* myName = filename;
char* konyvtar = "asd/";
 char* konyvtar2 = "qwe/";
void setup()
{
Serial.begin(9600);
Wire.begin(); //Important for RTClib.h
RTC.begin();

if (! RTC.isrunning()) {

Serial.println("RTC is NOT running!");
return;
}

Serial.print("Initializing SD card...");

pinMode(4, OUTPUT);

if (!SD.begin(4)) {
Serial.println("initialization failed!");
return;
}
Serial.println("initialization done.");
}

void loop()
{

getFileName();
delay(3000);
}

void getFileName(){

DateTime now = RTC.now();

filename[0] = (now.year()/1000)%10 + '0'; //To get 1st digit from year()
filename[1] = (now.year()/100)%10 + '0'; //To get 2nd digit from year()
filename[2] = (now.year()/10)%10 + '0'; //To get 3rd digit from year()
filename[3] = now.year()%10 + '0'; //To get 4th digit from year()
filename[4] = now.month()/10 + '0'; //To get 1st digit from month()
filename[5] = now.month()%10 + '0'; //To get 2nd digit from month()
filename[6] = now.day()/10 + '0'; //To get 1st digit from day()
filename[7] = now.day()%10 + '0'; //To get 2nd digit from day()
sprintf(masodik, "%s%02d%02d%02d.TXT",konyvtar, now.minute(),now.month(),now.year());
sprintf(filename, "%s%02d%02d%02d.TXT",konyvtar2, now.minute(),now.month(),now.year());
Serial.println(masodik);
Serial.println(filename);
}