Add date time format annotation on pojo for model query parameters

modules/openapi-generator/src/main/resources/JavaSpring/pojo.mustache

@@ -31,6 +31,12 @@ public class {{classname}} {{#parent}}extends {{{parent}}}{{/parent}}{{^parent}}
   private {{>nullableDataType}} {{name}} = {{#isNullable}}JsonNullable.undefined(){{/isNullable}}{{^isNullable}}{{#required}}{{{defaultValue}}}{{/required}}{{^required}}null{{/required}}{{/isNullable}};
   {{/isContainer}}
   {{^isContainer}}
+  {{#isDate}}
+  @org.springframework.format.annotation.DateTimeFormat(iso = org.springframework.format.annotation.DateTimeFormat.ISO.DATE)
+  {{/isDate}}
+  {{#isDateTime}}
+  @org.springframework.format.annotation.DateTimeFormat(iso = org.springframework.format.annotation.DateTimeFormat.ISO.DATE_TIME)
+  {{/isDateTime}}
   private {{>nullableDataType}} {{name}}{{#isNullable}} = JsonNullable.undefined(){{/isNullable}}{{^isNullable}}{{#defaultValue}} = {{{.}}}{{/defaultValue}}{{/isNullable}};
   {{/isContainer}}
 

modules/openapi-generator/src/test/java/org/openapitools/codegen/java/spring/SpringCodegenTest.java

@@ -544,4 +544,31 @@ public void doGenerateCookieParams() throws IOException {
         checkFileContains(generator, outputPath + "/src/main/java/org/openapitools/api/ZebrasApi.java", "@CookieValue");
         checkFileNotContains(generator, outputPath + "/src/main/java/org/openapitools/api/BirdsApi.java", "@CookieValue");
     }
+
+    @Test
+    public void doAnnotateDatesOnModelParameters() throws IOException {
+        File output = Files.createTempDirectory("test").toFile().getCanonicalFile();
+        output.deleteOnExit();
+        String outputPath = output.getAbsolutePath().replace('\\', '/');
+
+        OpenAPI openAPI = new OpenAPIParser()
+                .readLocation("src/test/resources/3_0/issue_5436.yml", null, new ParseOptions()).getOpenAPI();
+
+        SpringCodegen codegen = new SpringCodegen();
+        codegen.setOutputDir(output.getAbsolutePath());
+        codegen.additionalProperties().put(CXFServerFeatures.LOAD_TEST_DATA_FROM_FILE, "true");
+
+        ClientOptInput input = new ClientOptInput();
+        input.openAPI(openAPI);
+        input.config(codegen);
+
+        MockDefaultGenerator generator = new MockDefaultGenerator();
+        generator.opts(input).generate();
+
+        checkFileContains(generator, outputPath + "/src/main/java/org/openapitools/api/ZebrasApi.java",
+                "AnimalParams");
+        checkFileContains(generator, outputPath + "/src/main/java/org/openapitools/model/AnimalParams.java",
+                "@org.springframework.format.annotation.DateTimeFormat(iso = org.springframework.format.annotation.DateTimeFormat.ISO.DATE)",
+                "@org.springframework.format.annotation.DateTimeFormat(iso = org.springframework.format.annotation.DateTimeFormat.ISO.DATE_TIME)");
+    }
 }

modules/openapi-generator/src/test/resources/3_0/issue_5436.yml

@@ -0,0 +1,51 @@
+openapi: 3.0.0
+servers:
+  - url: 'localhost:8080'
+info:
+  version: 1.0.0
+  title: OpenAPI Zoo
+  license:
+    name: Apache-2.0
+    url: 'https://www.apache.org/licenses/LICENSE-2.0.html'
+paths:
+  /zebras:
+    get:
+      operationId: getZebras
+      parameters:
+        - in: query
+          name: limit
+          schema:
+            type: number
+        - $ref: '#/components/parameters/SearchParams'
+components:
+  parameters:
+    SearchParams:
+      name: animalParams
+      description: Search animal grouped parameters
+      in: query
+      style: form
+      explode: true
+      schema:
+        $ref: '#/components/schemas/AnimalParams'
+  schemas:
+    AnimalParams:
+      type: object
+      properties:
+        born:
+          type: string
+          format: date
+          example: '2019-12-01'
+        lastSeen:
+          type: string
+          format: date-time
+          example: '2020-02-22T10:30:00.000'
+        status:
+          type: integer
+          enum: [0,1]
+          default: 0
+        name:
+          type: string
+          example: 'Marty'
+        age:
+          type: integer
+          example: 15