DateTimePicker::make('my_date')

                    ->label('My date')

                    ->minDate(CarbonImmutable::now()->startOfDay())

                    ->withoutSeconds()

                    ->required(),

use Filament\Resources\Forms\Components\DateTimePicker;

...    

DateTimePicker::make('Created At')

        ->default(now()) // Set the default value to the current datetime

        ->format('Y-m-d H:i:s') // Set the datetime format if needed