Since 1 January 2015, the numbering of EU legal acts has changed. Documents published in the L series (Legislation) of the Official Journal of the European Union (OJ) will be numbered in the following standardised way:
The numbering and referencing of documents published before 1 January 2015 or in a series other than the L series of the OJ do not change.
More information is available via EUR-Lex, in English and in Dutch.