Refresh field after insert

I'm trying to create a trigger to update a value after insertion, or before it works.

I have the following table: test

Remembering that the date field type is timestamp and the default value is CURRENT_TIMESTAMP

id   |   date                   |   dado    |   dado2 
1    |   2018-10-22 14:43:32    |  Dado 1   |
2    |   2018-10-22 14:44:40    |  Dado 2   |
3    |   2018-10-22 14:44:41    |  Dado 3   |
4    |   2018-10-22 14:45:41    |  Dado 4   |

If I do the trigger using before insert , when using the field new.date the value comes null.

CREATE TRIGGER 'teste_before_insert' BEFORE INSERT ON 'teste' FOR EACH ROW BEGIN
  insert into debug_table (condicao, condicao2) VALUES (new.date, new.id);
END

This table debug_table was created to know if the value is coming, it inserts, but with null data

But if I use after insert , the field is filled in. I just want to update the dado 2 field.

So since the value works with after insert , I would like to update the same table with this trigger in the dado 2

But it seems that the update does not work