import org.junit.jupiter.api.Test;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;
import java.util.List;
import java.util.stream.Collectors;

public class Demo {

    @Test
    void name() throws IOException{
        List<String> dates = getDateFromCsv();  //đọc file csv    
        DateTimeFormatter formatter = getDateFormatter(); //tạo định dạng date

        List<LocalDate> dateList = dates.stream() //chuyển string -> date
                .map(date -> parseDate(formatter, date))
                .collect(Collectors.toList());

        System.out.println(dateList);
    }

    private DateTimeFormatter getDateFormatter() {
        return new DateTimeFormatterBuilder()
                .appendOptional(DateTimeFormatter.ofPattern("d-M-yyyy"))
                .appendOptional(DateTimeFormatter.ofPattern("d.M.yyyy"))
                .appendOptional(DateTimeFormatter.ofPattern("dd/M/yyyy"))
                .toFormatter();
    }

    private List<String> getDateFromCsv() throws IOException {
        Path path = Path.of("src/test/resources/date.csv");
        List<String> strings = Files.readAllLines(path);
        System.out.println(strings);
        return strings;
    }

    private LocalDate parseDate(DateTimeFormatter formatter, String text) {
        return LocalDate.parse(text, formatter);
    }
}

[2-1-2019, 10.07.2021, 15/10/2020, -1-2-9999]

java.time.format.DateTimeParseException: Text '-1-2-9999' could not be parsed: 
Invalid value for DayOfMonth (valid values 1 - 28/31): -1