File modification time
Java
import java.util.File; import java.util.Time; import java.util.Date; public class FileModicationTimeTest { // if 0L is returned then the file does not exist public static long getFileModificationTime(String filename) { // Get the last modified time long modifiedTime = new File(filename).lastModified(); return modifiedTime; } public static boolean setFileModificationTimeToNow(String filename) // Set the last modified time long newModifiedTime = System.currentTimeMillis(); boolean success = new File(filename).setLastModified(newModifiedTime); return success; } public static boolean setFileModificationTime(String filename, long timeInMs) // Set the last modified time boolean success = new File(filename).setLastModified(newModifiedTime); return success; } public static void test(String type, String filename) { long t = getFileModificationTime(filename); System.out.println("The following " + type + " called " + filename + (t == 0 ? " does not exists : " was modified at " + new Time(t).toString() ) ); System.out.println("The following " + type + " called " + filename + (!setFileModificationTimeToNow(filename) ? " does not exists. " : " was modified to current time." ) ); System.out.println("The following " + type + " called " + filename + (!setFileModificationTime(filename,t) ? " does not exists. " : " was modified to previous time." ) ); } public static void main(String args[]) { test("file", "output.txt"); test("file", File.seperator + "output.txt"); test("directory", "docs"); test("directory", File.seperator + "docs" + File.seperator); } }