Automatic Field Update

[serqet]

Hello,

I have written the following formulas in the formula part of the entity, there is no problem when I change the new record and record but the field does not update automatically when time passes. What could be the reason? Thanks.

ifThen(entity\isAttributeChanged('balangTarihi') && balangTarihi > datetime\today(),
aktifPasif = 'Pasif');
ifThen(entity\isNew() && balangTarihi > datetime\today(),
aktifPasif = 'Pasif');
ifThen(entity\isNew() && balangTarihi <= datetime\today(),
aktifPasif = 'Aktif');
ifThen(entity\isAttributeChanged('balangTarihi') && balangTarihi <= datetime\today(),
aktifPasif = 'Aktif');