
Write an implementation of the `getCustomDate()` function that returns the date in the format `15/03/1985` based on the timestamp passed.

Call examples:

```php
<?php

getCustomDate(1532435204); // 24/07/2018;
getCustomDate(532435204);  // 15/11/1986;
getCustomDate(5324352);    // 03/03/1970;
```
