And it's pretty easy to find. Just search:

DAY de MONTH de YEAR

e.g: 12 de fevereiro de 2017. Most dates work, though only from 2016 or 2017 onward. Here's a portuguese calendar for the month names: https://imgoat.com/uploads/3c65c29742/107300.jpg

I don't have much info on this, only saw it mentioned on a brazilian IB. Some videos on fist page have very few views so I assume this method isn't widely known. Be mindful when sharing.