Dealing with Empty Date Fields and Validation and Field updates

The error you're encountering is because the createFromFormat method expects a complete date format, but you're passing an incomplete format. To handle potentially null dates and convert them to a safe format for the database, you can modify your code as follows:

if ($request->has('installation_dt')) {
    $installationDate = $request->installation_dt;

    if (!empty($installationDate)) {
        $formFields['installation_dt'] = Carbon::createFromFormat('m/d/Y', $installationDate)->format('Y-m-d');
    } else {
        $formFields['installation_dt'] = null;
    }
}

In this solution, we first check if the installation_dt field exists in the request. If it does, we assign its value to the $installationDate variable. Then, we check if the $installationDate is not empty. If it's not empty, we convert it to the desired format using createFromFormat and assign it to $formFields['installation_dt']. If it is empty, we assign null to $formFields['installation_dt'].

This way, if the installation_dt field is empty, it will be stored as null in the database. Otherwise, it will be converted to the desired format and stored.