As soon as an opposition has been received, the date of filing of the opposition is entered in the Register of European Patents and published in the European Patent Bulletin. The same applies to the date on which opposition proceedings are concluded and to the outcome of the proceedings (see also A‑XI, 4).
Source: http://www.epo.org/law-practice/legal-texts/html/guidelines/e/d_i_8.htm
Date retrieved: 17 May 2021