Article 1 
The purpose of this Directive is to implement the Framework Agreement on part-time work concluded on 6 June 1997 between the general cross-industry organizations (UNICE, CEEP and the ETUC) annexed hereto. Article 2 1. Member States shall bring into force the laws, regulations and administrative provisions necessary to comply with this Directive not later than 20 January 2000, or shall ensure that, by that date at the latest, the social partners have introduced the necessary measures by agreement, the Member States being required to take any necessary measures to enable them at any time to be in a position to guarantee the results imposed by this Directive. They shall forthwith inform the Commission thereof. Member States may have a maximum of one more year, if necessary, to take account of special difficulties or implementation by a collective agreement. They shall inform the Commission forthwith in such circumstances. When Member States adopt the measures referred to in the first subparagraph, they shall contain a reference to this Directive or shall be accompanied by such reference on the occasion of their official publication. The methods of making such a reference shall be laid down by the Member States. 1a. As regards the United Kingdom of Great Britain and Northern Ireland, the date of 20 January 2000 in paragraph 1 shall be replaced by the date of 7 April 2000. 2. Member States shall communicate to the Commission the text of the main provisions of domestic law which they have adopted or which they adopt in the field governed by this Directive. Article 3 This Directive shall enter into force on the day of its publication in the Official Journal of the European Communities . Article 4 This Directive is addressed to the Member States.
Article 2 
1. Member States shall bring into force the laws, regulations and administrative provisions necessary to comply with this Directive not later than 20 January 2000, or shall ensure that, by that date at the latest, the social partners have introduced the necessary measures by agreement, the Member States being required to take any necessary measures to enable them at any time to be in a position to guarantee the results imposed by this Directive. They shall forthwith inform the Commission thereof. Member States may have a maximum of one more year, if necessary, to take account of special difficulties or implementation by a collective agreement. They shall inform the Commission forthwith in such circumstances. When Member States adopt the measures referred to in the first subparagraph, they shall contain a reference to this Directive or shall be accompanied by such reference on the occasion of their official publication. The methods of making such a reference shall be laid down by the Member States. 1a. As regards the United Kingdom of Great Britain and Northern Ireland, the date of 20 January 2000 in paragraph 1 shall be replaced by the date of 7 April 2000. 2. Member States shall communicate to the Commission the text of the main provisions of domestic law which they have adopted or which they adopt in the field governed by this Directive. Article 3 This Directive shall enter into force on the day of its publication in the Official Journal of the European Communities . Article 4 This Directive is addressed to the Member States.
Article 3 
This Directive shall enter into force on the day of its publication in the Official Journal of the European Communities . Article 4 This Directive is addressed to the Member States.
Article 4 
This Directive is addressed to the Member States.