Não é de hoje
This expression is used to describe something that is not new. It could be something that has been happening since the beginning of the times, since a country was created, since a building was constructed, since a school opened, since a relationship started, or just for a long time.
- Pegaram o João Vitor vendendo sem nota fiscal.
- Ih, mas isso não é de hoje. Todo mundo sabe que ele nunca pagou imposto.