8 – Convert current time from Unix timestamp to date format (d/m/y)

In my custom module (.module) file, I am using:

$current_time = Drupal::time()->getCurrentTime();
date_default_timezone_set('GMT');

to get the current date… However, the date value is returned in int A Unix timestamp like: 1556582116

I have tried so far something like:

$current_time = Drupal::time()->getCurrentTime();
$timenow = $current_time->format('Y-m-d H:i:s');

or

$current_time = Drupal::time()->getCurrentTime('d');

to get only the day value… but with no success

How can I return the date value in the format of: D/M/Y like: 30/04/2019 or 30/Apr/19