59Accordingly, the fact that the definition of the concept of working time refers to ‘national law and/or practice’ does not mean that the Member States may unilaterally determine the scope of that concept. Thus, those States may not make subject to any condition the right of employees to have working periods and corresponding rest periods duly taken into account since that right stems directly from the provisions of that directive. Any other interpretation would frustrate the objective of Directive 93/104 of harmonising the protection of the safety and health of workers by means of minimum requirements (see Case C-84/94 United Kingdom v Council [1996] ECR I-5755, paragraphs 45 and 75).
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