Getting and Setting the Modification Time of a File or Directory

   
import java.io.File;

public class Main {
  public static void main(String[] argv) throws Exception {

    File file = new File("filename");

    long modifiedTime = file.lastModified();
    // 0L is returned if the file does not exist

    long newModifiedTime = System.currentTimeMillis();
    boolean success = file.setLastModified(newModifiedTime);
    if (!success) {
      // operation failed.
    }
  }
}

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Getting and Setting the Modification Time of a File or Directory : Files « File Input Output « Java

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