How to format FileTime in Java

In Java, we can use DateTimeFormatter to convert the FileTime to other custom date formats.

public static String formatDateTime(FileTime fileTime) {

        LocalDateTime localDateTime = fileTime
                .toInstant()
                .atZone(ZoneId.systemDefault())
                .toLocalDateTime();

        return localDateTime.format(
              DateTimeFormatter.ofPattern("MM/dd/yyyy HH:mm:ss"));
}

1. File Last Modified Time

This example displays the last modified time of a file in a custom date format.

GetLastModifiedTime.java

package com.favtuts.io.howto;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
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 GetLastModifiedTime {
    
    private static final DateTimeFormatter DATE_FORMATTER = 
        DateTimeFormatter.ofPattern("MM/dd/yyyy HH:mm:ss");
    
    public static void main(String[] args) {
        
        String fileName = "/home/tvt/workspace/favtuts/sample.csv";

        try {
            
            Path file = Paths.get(fileName);
            BasicFileAttributes attr = Files.readAttributes(file, BasicFileAttributes.class);

            // default YYYY-MM-DDThh:mm:ss[.s+]Z
            System.out.println("lastModifiedTime: " + attr.lastModifiedTime());     // 2022-05-08T16:56:58.214937Z

            FileTime fileTime = attr.lastModifiedTime();
            System.out.println("lastModifiedTime: " + formatDateTime(fileTime));

        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    public static String formatDateTime(FileTime fileTime) {

        LocalDateTime localDateTime = fileTime
            .toInstant()
            .atZone(ZoneId.systemDefault())
            .toLocalDateTime();
        
        return localDateTime.format(DATE_FORMATTER);
    }
}

Output

lastModifiedTime: 2022-05-08T16:56:58.214937Z
lastModifiedTime: 05/08/2022 23:56:58

Download Source Code

$ git clone https://github.com/favtuts/java-core-tutorials-examples

$ cd java-io

References

• Managing File Metadata
• Java Date Time Tutorials
• How to get file last modified date in Java