Leap seconds are handled even better (#508)

pom.xml

@@ -71,7 +71,7 @@
         <version.mockito>2.7.21</version.mockito>
         <version.hamcrest>2.2</version.hamcrest>
         <version.undertow>2.2.14.Final</version.undertow>
-        <version.itu>1.3.0</version.itu>
+        <version.itu>1.5.1</version.itu>
     </properties>
     <dependencies>
         <dependency>

src/main/java/com/networknt/schema/DateTimeValidator.java

@@ -65,7 +65,11 @@ private boolean isLegalDateTime(String string) {
             return tryParse(() -> {
                 try {
                     ITU.parseDateTime(string);
-                } catch (LeapSecondException ignored) {}
+                } catch (LeapSecondException ex) {
+                    if(!ex.isVerifiedValidLeapYearMonth()) {
+                        throw ex;
+                    }
+                }
             });
         } else {
             throw new IllegalStateException("Unknown format: " + formatName);

src/test/resources/draft2019-09/optional/format/date-time.json

@@ -72,7 +72,7 @@
       },
       {
         "description": "an invalid date-time string with leap second",
-        "data": "1998-10-31T23:59:60Z",
+        "data": "1997-12-31T23:59:60Z",
         "valid": false
       }
     ]

src/test/resources/draft7/optional/format/date-time.json

@@ -72,7 +72,7 @@
       },
       {
         "description": "an invalid date-time string with leap second",
-        "data": "1998-10-31T23:59:60Z",
+        "data": "1997-12-31T23:59:60Z",
         "valid": false
       }
     ]