@DataProvider(name = "sampleToString")
  Object[][] provider_sampleToString() {

    return new Object[][] { { 2008, 7, 5, 2, 1, 0, 0, "2008-07-05T02:01" },
        { 2007, 12, 31, 23, 59, 1, 0, "2007-12-31T23:59:01" },
        { 999, 12, 31, 23, 59, 59, 990000000, "0999-12-31T23:59:59.990" },
        { -1, 1, 2, 23, 59, 59, 999990000, "-0001-01-02T23:59:59.999990" },
        { -2008, 1, 2, 23, 59, 59, 999999990, "-2008-01-02T23:59:59.999999990" }, };
  }

  @Test(dataProvider = "sampleToString", groups = { "tck" }