fix: query aggregation pipeline cannot handle value of type Date when directAccess: true (#8167)

spec/ParseQuery.Aggregate.spec.js

@@ -666,6 +666,23 @@ describe('Parse.Query Aggregate testing', () => {
       });
   });
 
+  it('should aggregate with Date object (directAccess)', async () => {
+    const rest = require('../lib/rest');
+    const auth = require('../lib/Auth');
+    const TestObject = Parse.Object.extend('TestObject');
+    const date = new Date();
+    await new TestObject({ date: date }).save(null, { useMasterKey: true });
+    const config = Config.get(Parse.applicationId);
+    const resp = await rest.find(
+      config,
+      auth.master(config),
+      'TestObject',
+      {},
+      { pipeline: [{ $match: { date: { $lte: new Date() } } }] }
+    );
+    expect(resp.results.length).toBe(1);
+  });
+
   it('match comparison query', done => {
     const options = Object.assign({}, masterKeyOptions, {
       body: {

src/Adapters/Storage/Mongo/MongoStorageAdapter.js

@@ -952,6 +952,9 @@ export class MongoStorageAdapter implements StorageAdapter {
   // an operator in it (like $gt, $lt, etc). Because of this I felt it was easier to make this a
   // recursive method to traverse down to the "leaf node" which is going to be the string.
   _convertToDate(value: any): any {
+    if (value instanceof Date) {
+      return value;
+    }
     if (typeof value === 'string') {
       return new Date(value);
     }