java.util.Date(int) constructor works wrong

(new java.util.Date(0)).toString()
returns "Wed Dec 31 16:00:00 PST 1969"
instead of "Thu Jan 01 00:00:00 PST 1970"

=== Here is minimized test demonstrating the bug ===
class java_sql_Date3 {
  public static void main (String args[]) {
    java.util.Date d=new java.util.Date(0);
    System.out.println(d);
  }
}

=== Here is output of te test ===
Wed Dec 31 16:00:00 PST 1969