Laravel time Validation

 I built a booking form where user can select a starting date & time for the booking, but now I'm facing some issues to validate it.

If the beginning_date is today, the beginning_time should not be below than the current time, but,if the beginning_date is tomorrow than time can be anything.

I've tried to implement some rules, but it doesn't seem to work, I also had a look at laravel docs but doeesn't seem that there's anything for this problem.

What I've tried so far is :

$validated = $request->validate([

            'beginning_date' => "bail|required|after_or_equal:' . date(DATE_ATOM)'",
            'beginning_time' => [
                'required',
                Rule::when(('beginning_date' > date(DATE_ATOM)),  "after_or_equal:" . Carbon::now()->format('H:i'))
            ],
            'quantity' => 'bail|digits_between:1,9',
            'duration' => 'required',
            'type'=>'required'
        ]);

But it doesn't seem to work. Do you have any idea on how i can validate this inputs?

Thank you