Sketch code

#include <SD.h> // SD card libray
#include <Wire.h> // I2C
#include <Time.h> // Time Manipulation
#include <DS1307RTC.h> // DS1307 RTC

int irpin = 2; // IR sensor pin
char timedatebuf[65]; // Time and Date string buffer
int year4digit; // 4 digit year

void setup()
{
Serial.begin(9600); // Serial monitor used for testing
pinMode (irpin, INPUT);

Serial.print("Initializing SD card...");
pinMode(10, OUTPUT);

if (!SD.begin(10)) { // check if card is installed
Serial.println("No SD Card present in module");
return;
}
Serial.println("SD Card Ready");
}

void loop()
{
tmElements_t tm;

if (digitalRead (irpin) == LOW) // IR detected
{
if (RTC.read(tm)) { // Get Time/Date from RTC1307

year4digit = tm.Year + 1970; // 4 digit year variable

// Format Time & Date string in timedatebuf
sprintf(timedatebuf, "Time: %02d:%02d:%02d Date: %02d/%02d/%02d ---->INTRUDER DETECTED!!!",tm.Hour, tm.Minute, tm.Second, tm.Day, tm.Month, year4digit);

File dataFile = SD.open("intruder.txt", FILE_WRITE); // Open or Create file

if (dataFile) { // Check if file exist on SD Card
dataFile.println(timedatebuf);
dataFile.close(); // Close file
Serial.println(timedatebuf);
}

else {
Serial.println("error opening intruder.txt"); // if file not on SD Card
}

}

}
while (digitalRead (irpin) == LOW) { // wait until IR is HIGH again
}

delay(100); // delay to give time for IR to reset
}