adding yet another test to datetime parsing

Author: erosb

core/src/test/java/org/everit/json/schema/internal/DefaultFormatValidatorTest.java

@@ -41,6 +41,12 @@ private void assertSuccess(final String subject, final FormatValidator format) {
     Assert.assertFalse("failure not exist", opt.isPresent());
   }
 
+  @Test
+  public void dateTimeExceedingLimits() {
+    assertFailure("1996-60-999T16:39:57-08:00", new DateTimeFormatValidator(),
+        "[1996-60-999T16:39:57-08:00] is not a valid date-time");
+  }
+
   @Test
   public void dateTimeFormatFailure() {
     assertFailure("2015-03-13T11:00:000", new DateTimeFormatValidator(),