<form [formGroup]="testForm">
    <nx-timefield
        label="Time"
        formControlName="timefieldReactive"
        enableTimeValidation
    >
        <nx-error> Invalid time input. </nx-error>
    </nx-timefield>
</form>

<p>Errors: {{ testForm.controls.timefieldReactive.errors | json}}</p>
