38Since Article 5 of Directive 2003/88 does not contain any reference to the national law of the Member States, the expression ‘per each seven-day period’, used in that article, must be regarded as an autonomous concept of EU law and interpreted uniformly throughout the European Union, irrespective of characterisation in the Member States, taking into account the wording of the provision at issue and also its context and the purpose of the rules of which it forms part (see, to that effect, judgments of 2 March 2017, J.D, C‑4/16, EU:C:2017:153, paragraphs 23 and 25, and of 11 May 2017, Krijgsman, C‑302/16, EU:C:2017:359, paragraph 24 and the case-law cited).
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