import java.io.IOException;
import java.nio.file.*;
import java.util.Enumeration;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

public class JarTime {
  public static void main(String[] args) throws IOException {
    try (JarFile jf = new JarFile(args[0])) {
      Enumeration<JarEntry> entries = jf.entries();
      while (entries.hasMoreElements()) {
        JarEntry je = entries.nextElement();
        System.err.println(je.getName() + " / " + je.getLastModifiedTime());
      }
    }
  }
}