How to get Carbon time with format like that '2019-07-20T09:20:33+00:00' in PHP

I want to get string of current time with format like '2019-07-20T09:20:33+00:00' using Carbon.

Currently I'm using Carbon::now()->toDateTimeString(); --> output: 2019-07-20 21:02:48

What is name of this format time 2019-07-20T09:20:33+00:00 ?

Thank you

via Chebli Mohamed