Java - Converting FileTime To Formatted String and vice versa

Java Date Time Java 

Following example shows how to convert FileTime to a formatted String and vice-versa:

package com.logicbig.example;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.attribute.BasicFileAttributes;
import java.nio.file.attribute.FileTime;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;

public class FileTimeToFormattedString {
    private static final DateTimeFormatter DATE_FORMATTER_WITH_TIME = DateTimeFormatter
            .ofPattern("MMM d, yyyy HH:mm:ss.SSS");

    public static String fileTimeToString(FileTime fileTime) {
        String s = parseToString(
                fileTime.toInstant().atZone(ZoneId.systemDefault()).toLocalDateTime());
        return s;
    }

    public static FileTime fileTimeFromString(String dateTimeString) {
        LocalDateTime localDateTime = parseFromString(dateTimeString);
        return FileTime.from(localDateTime.atZone(ZoneId.systemDefault()).toInstant());
    }

    public static String parseToString(LocalDateTime localDateTime) {
        return localDateTime.format(DATE_FORMATTER_WITH_TIME);
    }

    public static LocalDateTime parseFromString(String date) {
        return LocalDateTime.parse(date, DATE_FORMATTER_WITH_TIME);
    }

    public static void main(String[] args) throws IOException {
        //create a file
        Path path = Files.createTempFile("test", ".txt");
        System.out.println(path);
        System.out.println(Files.exists(path));
        path.toFile().deleteOnExit();
        //get creation time
        BasicFileAttributes bfa = Files.readAttributes(path, BasicFileAttributes.class);
        FileTime fileTime = bfa.creationTime();
        System.out.println("fileTime: " + fileTime);
        //convert creation time to string
        String s = fileTimeToString(fileTime);
        System.out.println("FileTime toString: " + s);

        FileTime fileTime1 = fileTimeFromString(s);
        System.out.println("FileTime fromString: " + fileTime1);
    }
}

C:\Users\Joe\AppData\Local\Temp\test1293045960670637876.txt
true
fileTime: 2019-02-11T08:35:20.318203Z
FileTime toString: Feb 11, 2019 02:35:20.318
FileTime fromString: 2019-02-11T08:35:20.318Z

Above example can also be used to convert FileTime to LocalDateTime and vice versa.