@Override
            public Date deserialize(JsonParser jsonParser,
                                    DeserializationContext deserializationContext) throws IOException {

                return fromJson(jsonParser.getValueAsString());
            }
Contains Jackson module for serializing dates to ISO8601 format per the <a href="https://states-language.net/spec.html#timestamps">spec</a>.
aws-java-sdk-stepfunctions/src/main/java/com/amazonaws/services/stepfunctions/builder/internal/DateModule.java