add some doc

docs/advanced_usage.md

@@ -62,7 +62,7 @@ $userRepository->getPropertyValue(identifier: 3, property: 'name');
 // ⚠️ Warning: this method cannot retrieve array or nested objects when HASH format
 ```
 
-You can also request objects or collection by nested objects properties
+#### You can also request objects or collection by nested objects properties
 ```php
 // Will retrieve 1 user from the category called 'CUSTOMER'
 $userRepository->findOneBy(['category_name' => 'CUSTOMER']); 
@@ -71,6 +71,19 @@ $userRepository->findOneBy(['category_name' => 'CUSTOMER']);
 $userRepository->findBy(['category_id' => 3]); 
 ```
 
+#### Request by date
+⚠️ Warning, this kind of request is only available with JSON format mapping
+```php
+
+// Will retrieve users from datetime 
+$userRepository->findOneBy(['createdAt' => new DateTime('2021-01-01 00:00:00')]); 
+$userRepository->findBy(['createdAt' => new DateTime('2021-01-01 00:00:00')]); 
+
+// Will retrieve users by datetime as string
+$userRepository->findOneBy(['createdAt' => '2021-01-01 00:00:00']); 
+$userRepository->findBy(['createdAt' => '2021-01-01 00:00:00']); 
+```
+
 ## Repository
 
 You can create your own repository to query your objects in Redis. Then inject it in the