Acontece que o campo de data faz atualizar automaticamente. Simplesmente requer fechar e reabrir o documento.
Note: The date may not update in your document unless you close, then re-open the file or right-click the field and select “Update Field“.
Now the date in your document will be inserted into the document and will update automatically based on the selection you made whenever you open the [Word] document.
Technipages - Word 2016 & 2013: Insert Date that Updates Itself Automatically