LogData.yml

import java.io.FileReader;
import java.text.SimpleDateFormat;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Date;
import java.io.BufferedReader;

public class LoggerApp {

	public static void main(String[] args) {

		// Creates a CSV File with current Year and Month
		String fileName = new SimpleDateFormat("MM-yyyy'.csv'").format(new Date());

		// Proof of File exist and read the file
		File f = new File(fileName);
		if (f.exists() && !f.isDirectory()) {
			FileReader fr = null;
			try {
				fr = new FileReader(f);
			} catch (FileNotFoundException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}

			BufferedReader br = new BufferedReader(fr);

		} else {
			String fileName1 = new SimpleDateFormat("MM-yyyy'.csv'").format(new Date());
		}

		FileWriter writer;
		File datei = new File(fileName);
		// LocalDateTime currentDateTime = LocalDateTime.now();

		try {
			LocalDateTime currentDateTime = LocalDateTime.now();
			// System.out.println("Before formatting: " + currentDateTime);

			writer = new FileWriter(datei);
			// writer.write(currentDateTime.toString());
			DateTimeFormatter changeDateTimeFormat = DateTimeFormatter.ofPattern("dd-MM-yyyy HH:mm");
			writer.write(System.getProperty("line.separator"));

			String formattedDate = changeDateTimeFormat.format(currentDateTime);
			writer.write(formattedDate);
			writer.flush();
			writer.close();
		} catch (Exception e) {
			// TODO: handle exception
			e.printStackTrace();
		}

	}

}