Try something like:
public class JDT
{
public static void main(String args[])
{
long millisec = 1435237366000L;
java.util.Date dt = new java.util.Date(millisec);
java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat("EEE MMM dd HH:mm:ss yyyy");
System.out.println(sdf.format(dt));
}
}