Data entry into the database is done through the datetime-local form and with the help of PDO what parameter should be in PDO?

Question

PHP

This form sets the date
input type="datetime-local" class="form-control" name='data'

And this is a line in the input to the database via PDO
$data->bindParam(":data", $data, PDO: :PARAM_STR);

What should PARAM be?