Repository: networknt/json-schema-validator (java)
Issue: date-time fields with valid negative offsets are marked as invalid - need to upgrade com.ethlo.time:itu to version 1.7.0
Using version 1.0.69 of json-schema-validator, date-time values with certain valid negative offsets (for example, "2022-05-25T08:27:53-02:30", Newfoundland time) fail validation.

The problem is with the com.ethlo.time:itu library. If this library is updated from version 1.5.1 to version 1.7.0, this problem goes away. We have been overriding this dependency in our applications to avoid this issue, but it would be better if json-schema-validator did the upgrade itself.
Pull request description: fixes #575
This pull request upgrades com.ethlo.time:itu from version 1.5.1 to version 1.7.0. Some valid negative time zone offsets (e.g. -2:30, Newfoundland time) are marked as invalid by version 1.5.1 of the itu library.

Unit tests are included to ensure that time zone offsets validate as expected and invalid time representations are marked as such.

Patch:
diff --git a/pom.xml b/pom.xml
index 9d2ffc9..e002f2f 100644
--- a/pom.xml
+++ b/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>1.5.1</version.itu>
+        <version.itu>1.7.0</version.itu>
     </properties>
     <dependencies>
         <dependency>


Test patch:
diff --git a/src/test/java/com/networknt/schema/Issue575Test.java b/src/test/java/com/networknt/schema/Issue575Test.java
new file mode 100644
index 0000000..ff3c221
--- /dev/null
+++ b/src/test/java/com/networknt/schema/Issue575Test.java
@@ -0,0 +1,127 @@
+package com.networknt.schema;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import java.io.InputStream;
+import java.util.Set;
+import java.util.stream.Stream;
+
+/**
+ * This project uses a dependency (com.ethlo.time:itu) to validate time representations. Version 1.51 of this library
+ * has a problem dealing with certain time zones having a negative offset; for example "-2:30" (Newfoundland time, NDT).
+ * Moving to version 1.7.0 of this library resolves the issue.
+ *
+ * This test class confirms that valid negative offsets do not result in a JSON validation error if the ITU library is
+ * updated to version 1.7.0 or later.
+ */
+public class Issue575Test {
+    private static JsonSchema schema;
+
+    @BeforeAll
+    static void init() {
+        JsonSchemaFactory factory = JsonSchemaFactory.getInstance(SpecVersion.VersionFlag.V201909);
+        String schemaPath = "/schema/issue575-2019-09.json";
+        InputStream schemaInputStream = Issue575Test.class.getResourceAsStream(schemaPath);
+        schema = factory.getSchema(schemaInputStream);
+    }
+
+    public static Stream<Arguments> validTimeZoneOffsets() {
+        String json1 = "{\"testDateTime\":\"2022-05-18T08:27:53-05:00\"}";         // America/New_York
+        String json2 = "{\"testDateTime\":\"2022-05-18T08:27:53-04:00\"}";         // America/New_York (DST)
+        String json3 = "{\"testDateTime\":\"2022-05-18T08:27:53-03:30\"}";         // America/St_Johns
+        String json4 = "{\"testDateTime\":\"2022-05-18T08:27:53-02:30\"}";         // America/St_Johns (DST)
+        String json5 = "{\"testDateTime\":\"2022-05-18T08:27:53+02:00\"}";         // Africa/Cairo
+        String json6 = "{\"testDateTime\":\"2022-05-18T08:27:53+03:30\"}";         // Asia/Tehran
+        String json7 = "{\"testDateTime\":\"2022-05-18T08:27:53+04:30\"}";         // Asia/Tehran (DST)
+        String json8 = "{\"testDateTime\":\"2022-05-18T08:27:53+04:00\"}";         // Asia/Dubai
+        String json9 = "{\"testDateTime\":\"2022-05-18T08:27:53+05:00\"}";         // Indian/Maldives
+        String json10 = "{\"testDateTime\":\"2022-05-18T08:27:53+05:30\"}";        // Asia/Kolkata
+        String json11 = "{\"testDateTime\":\"2022-05-18T08:27:53+10:00\"}";        // Australia/Sydney
+        String json12 = "{\"testDateTime\":\"2022-05-18T08:27:53+11:00\"}";        // Australia/Sydney (DST)
+        String json13 = "{\"testDateTime\":\"2022-05-18T08:27:53+14:00\"}";        // Pacific/Kiritimati
+        String json14 = "{\"testDateTime\":\"2022-05-18T18:45:32.123-05:00\"}";    // America/New_York
+        String json15 = "{\"testDateTime\":\"2022-05-18T18:45:32.123456-05:00\"}"; // America/New_York
+        String json16 = "{\"testDateTime\":\"2022-05-18T08:27:53Z\"}";             // UTC
+        String json17 = "{\"testDateTime\":\"2022-05-18T08:27:53+00:00\"}";        // UTC
+
+        return Stream.of(
+                Arguments.of(json1),
+                Arguments.of(json2),
+                Arguments.of(json3),
+                Arguments.of(json4),
+                Arguments.of(json5),
+                Arguments.of(json6),
+                Arguments.of(json7),
+                Arguments.of(json8),
+                Arguments.of(json9),
+                Arguments.of(json10),
+                Arguments.of(json11),
+                Arguments.of(json12),
+                Arguments.of(json13),
+                Arguments.of(json14),
+                Arguments.of(json15),
+                Arguments.of(json16),
+                Arguments.of(json17)
+        );
+    }
+
+    /**
+     * Confirms that valid time zone offsets do not result in a JSON validation error.
+     *
+     * @param jsonObject a sample JSON payload to test
+     */
+    @ParameterizedTest
+    @MethodSource("validTimeZoneOffsets")
+    void testValidTimeZoneOffsets(String jsonObject) throws JsonProcessingException {
+        Set<ValidationMessage> errors = schema.validate(new ObjectMapper().readTree(jsonObject));
+        Assertions.assertTrue(errors.isEmpty());
+    }
+
+    public static Stream<Arguments> invalidTimeRepresentations() {
+        // Invalid JSON payload: 30 days in April
+        String json1 = "{\"testDateTime\":\"2022-04-31T08:27:53+05:00\"}";
+        // Invalid JSON payload: Invalid date/time separator
+        String json2 = "{\"testDateTime\":\"2022-05-18X08:27:53+05:00\"}";
+        // Invalid JSON payload: Time zone details are missing
+        String json3 = "{\"testDateTime\":\"2022-05-18T08:27:53\"}";
+        // Invalid JSON payload: seconds missing from time
+        String json4 = "{\"testDateTime\":\"2022-05-18T11:23Z\"}";
+        // Invalid JSON payload: Text instead of date-time value
+        String json5 = "{\"testDateTime\":\"Orlando\"}";
+        // Invalid JSON payload: A time zone offset of +23:00 is not valid
+        String json6 = "{\"testDateTime\":\"2022-05-18T08:27:53+23:00\"}";
+        // Invalid JSON payload: A time zone offset of -23:00 is not valid
+        String json7 = "{\"testDateTime\":\"2022-05-18T08:27:53-23:00\"}";
+        // Invalid JSON payload: com.ethlo.time:itu does not allow offset -00:00 (Valid per RFC3339 section 4.3. but prohibited in ISO-8601)
+        String json8 = "{\"testDateTime\":\"2022-05-18T08:27:53-00:00\"}";
+
+        return Stream.of(
+                Arguments.of(json1),
+                Arguments.of(json2),
+                Arguments.of(json3),
+                Arguments.of(json4),
+                Arguments.of(json5),
+                Arguments.of(json6),
+                Arguments.of(json7),
+                Arguments.of(json8)
+        );
+    }
+
+    /**
+     * Confirms that invalid time representations result in one or more a JSON validation errors.
+     *
+     * @param jsonObject a sample JSON payload to test
+     */
+    @ParameterizedTest
+    @MethodSource("invalidTimeRepresentations")
+    void testInvalidTimeRepresentations(String jsonObject) throws JsonProcessingException {
+        Set<ValidationMessage> errors = schema.validate(new ObjectMapper().readTree(jsonObject));
+        Assertions.assertFalse(errors.isEmpty());
+    }
+}
diff --git a/src/test/resources/schema/issue575-2019-09.json b/src/test/resources/schema/issue575-2019-09.json
new file mode 100644
index 0000000..55187f5
--- /dev/null
+++ b/src/test/resources/schema/issue575-2019-09.json
@@ -0,0 +1,14 @@
+{
+  "$schema" : "https://json-schema.org/draft/2019-09/schema#",
+  "title": "Test Time Zone Schema (for testing time zones with negative offsets)",
+  "type": "object",
+  "properties": {
+    "testDateTime": {
+      "description": "A date-time value.",
+      "type" : "string",
+      "minLength" : 1,
+      "maxLength" : 32,
+      "format" : "date-time"
+    }
+  }
+}
\ No newline at end of file