Created issue_589 spec file and yaml

test/issue_589.spec.ts

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+import * as path from 'path';
+import * as express from 'express';
+import * as request from 'supertest';
+import * as assert from 'assert';
+import { createApp } from './common/app';
+
+describe("DateFormats", () => {
+  let app = null;
+
+  before(async () => {
+    // Set up the express app
+    const apiSpec = path.join('test', 'resources', 'issue_589.yaml');
+    app = await createApp({ apiSpec }, 1996, (app) =>
+      app.use(
+        `${app.basePath}`,
+        express.Router().get(`/user`, (req, res) => res.json({id: 0, name: "Nick", date: new Date("1996-01-03T22:00:00.000Z")})),
+      ),
+    );
+  });
+
+  after(() => {
+    app.server.close();
+  });
+
+  it('should get the correct date', async () =>
+    request(app)
+      .get(`${app.basePath}/user`)
+      .expect(200).then((res)=>
+      {
+        assert.strictEqual(res.body.id, 0);
+        assert.strictEqual(res.body.name, "Nick"); 
+        assert.strictEqual(res.body.date, "1996-01-04"); 
+      })
+    );
+});

test/resources/issue_589.yaml

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+openapi: 3.0.0
+servers:
+  # Added by API Auto Mocking Plugin
+  - description: SwaggerHub API Auto Mocking
+    url: https://virtserver.swaggerhub.com/babaliaris/test/1.0.0
+  - description: My Computer
+    url: http://localhost:1996
+  - description: Express Open Api Validator
+    url: /v1/
+info:
+  description: This is a simple API
+  version: "1.0.0"
+  title: Simple Inventory API
+  contact:
+    email: you@your-company.com
+  license:
+    name: Apache 2.0
+    url: 'http://www.apache.org/licenses/LICENSE-2.0.html'
+
+paths:
+  /user:
+    get:
+      tags:
+        - Users
+      summary: Get a user.
+      operationId: getUser
+
+      responses:
+
+        '200':
+          description: Get the json user data.
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/User'
+        default:
+          description: Something went wrong.
+
+components:
+  schemas:
+    User:
+      type: object
+      required:
+        - id
+        - name
+        - date
+      properties:
+        id:
+          type: integer
+        name:
+          type: string
+        date:
+          type: string
+          format: date