Set a date in model

You could use the model's events to intercept the updating event and set a value on the instance before it is persisted. There are a small number of different approaches from a boot() method and Closure, to a $dispatchesEvents and Event Handler class; the suitability of a particular approach would depend on the complexity of the check you are performing.

EDIT example of a Closure approach

protected static function boot()
{
        static::updating(function ($model) {
            if ($model->someCondition) {
                $model->update(['date' => now()]);
            }
        });
}

I have gone for this approach do you think it will be ok?

 if($request->has('ofs')){
            $data['ofs_updated'] = \Carbon\Carbon::now();
        }

Oh, I missed the certain input part!

Yes, when it is dependent on the request, then your way is more appropriate. (Don't forget to save()

FWIW, there is a now() helper method which returns the same Carbon instance as \Carbon\Carbon::now(); - looks neater in my opinion.