SimpleDateFormat产生错误的结果

public class ThreadSafeDateFormat {
    private static final ThreadLocal<SimpleDateFormat> dateFormat = new ThreadLocal<SimpleDateFormat>() {
        @Override
        protected SimpleDateFormat initialValue() {
            return new SimpleDateFormat("yyyy-MM-dd");
        }
    };

    public static String format(Date date) {
        return dateFormat.get().format(date);
    }

    public static Date parse(String dateString) throws ParseException {
        return dateFormat.get().parse(dateString);
    }
}

import java.time.LocalDate;
import java.time.format.DateTimeFormatter;

public class ThreadSafeDateFormat {
    private static final DateTimeFormatter dateFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");

    public static String format(LocalDate date) {
        return dateFormatter.format(date);
    }

    public static LocalDate parse(String dateString) {
        return LocalDate.parse(dateString, dateFormatter);
    }
}