36Concerning infringement proceedings under Article 260(2) TFEU, the reference date which must be used for assessing whether there has been a failure to fulfil obligations is that of the expiry of the period prescribed in the letter of formal notice issued under that provision (judgment of 15 October 2015 in Commission v Greece, C‑167/14, EU:C:2015:684, paragraph 29 and the case-law cited).
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