On EUR-Lex, find the 'Treaty establishing the European Economic Community (1957)'. Identify its CELEX number. Then, navigate to its document information page and list all dates provided under the 'Dates' section, including the 'Date of document', 'Date of effect', and 'Date of signature'.
Navigate to the EUR-Lex homepage. Click on 'EU law' to expand the section. Click on 'Treaties' to expand the sub-menu. Click on 'Founding treaties'. On the 'Founding treaties' page, locate the 'Treaty establishing the European Economic Community (1957)'. Identify and extract its CELEX number. Click the CELEX number link for the 'Treaty establishing the European Economic Community (1957)' to access its dedicated page. On the document's page, click on the 'Document information' link. On the 'Document information' page, locate the 'Dates' section. Extract and state all dates listed within the 'Dates' section.
Successfully navigate to the 'Founding treaties' page. Identify the CELEX number for the 'Treaty establishing the European Economic Community (1957)' as '11957E/TXT'. Successfully access the document's dedicated page. Successfully navigate to the 'Document information' section. State the 'Date of document' as '25/03/1957'. State the 'Date of effect' as '01/01/1958'. State the 'Date of signature' as '25/03/1957'.