34In Case C-486/08 Zentralbetriebsrat der Landeskrankenhäuser Tirols [2010] ECR I-3527, paragraph 33, the Court evoked Clause 4.2 of the framework agreement on part-time work, concluded on 6 June 1997, which is included in the annex to Directive 97/81/EC of the Council, of 15 December 1997, concerning the Framework Agreement on part-time work concluded by UNICE, CEEP and the ETUC (OJ 1998 L 14, p. 9), as modified by Directive 98/23/EC of the Council of 7 April 1998 (OJ 1998 L 131, p. 10), according to which, where it is appropriate, the rule of pro rata temporis applies to the conditions of employment of part-time workers. The Court has applied that rule to the grant of annual leave for a period of part-time employment, because for such a period, the reduction of annual leave by comparison to that granted for a period of full-time employment is justified on objective grounds.
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