creating a form_validators for dates

creating a form_validators for dates, how to proceed?

view.modulo

<div class="form-group">
                        <label class="col-sm-2 control-label">Data de Inativação</label>
                       <div class="col-sm-2">
                       <input type="date" name="data_inativacao" class="form-control" placeholder="Data de Inativação" required >
                    </div>


I want to use validation in the controler, in the insertion of the data