This method should throw IllegalArgumentException but it doesn't

=== Here is the test demonstrating ther bug ===
class java_sql_Timestamp3 {
  public static void main (String args[]) {
    java.sql.Timestamp t=new java.sql.Timestamp(96,11,13,14,15,25,745634000);
    t.setNanos(-10000);
    System.out.println(t.getNanos());
  }
}

=== Here is the output of the test ===
-10000