@Test // before Java time
 public void testconvertToJavaTime7() {
   t = GPXtime.createGPXtime("1969-02-22T00:00:00Z");
   if (t != null) {
     ExpectedConvertTime = 0;
     assertEquals(ExpectedConvertTime, t.convertToJavaTime());
   } else assertEquals(null, t);
 }
 @Test // invalid time to create/ should return null
 public void testconvertToJavaTime6() {
   t = GPXtime.createGPXtime("1970-02-29T00:00:00Z");
   if (t != null) {
     ExpectedConvertTime = 0;
     assertEquals(ExpectedConvertTime, t.convertToJavaTime());
   } else System.out.println(t);
 }
 @Test // consider 2000 leap year
 public void testconvertToJavaTime3() {
   t = GPXtime.createGPXtime("2000-01-01T00:00:00Z");
   if (t != null) {
     ExpectedConvertTime = (365 + 365 + 366) * 24 * 60 * 60 * 1000;
     assertEquals(ExpectedConvertTime, t.convertToJavaTime());
   }
 }
 @Test // The same day. (day should minus 1)
 public void testconvertToJavaTime4() {
   t = GPXtime.createGPXtime("1970-01-01T00:00:00Z");
   if (t != null) {
     ExpectedConvertTime = 0;
     assertEquals(ExpectedConvertTime, t.convertToJavaTime());
   }
 }
 /*test convertToJavaTime*/
 @Test // A day later
 public void testconvertToJavaTime1() {
   t = GPXtime.createGPXtime("1970-01-02T00:00:00Z");
   if (t != null) {
     ExpectedConvertTime = 24 * 60 * 60 * 1000;
     assertEquals(ExpectedConvertTime, t.convertToJavaTime());
   }
 }