time format for time in laravel validation code example

Example 1: Date time format for laravel validation

$request->validate([
        'start_date' => 'date_format:d/m/Y',
        'end_date' => 'date_format:d/m/Y'
    ]);

Example 2: laravel validation time hours minutes format

public function store(Illuminate\Http\Request $request)
{
    $this->validate($request, [
        'time_start' => 'date_format:H:i',
        'time_end' => 'date_format:H:i|after:time_start',
    ]);

    // do other stuff
}