Employers must allow employees to alter the dates of pre-arranged parental leave in order to take maternity leave where they unexpectedly become pregnant (Kiiski v Tampereen, ECJ). The employee would presumably be entitled to take the parental leave at another time, in the same way as a pregnant worker must be allowed to take her statutory annual leave at a time other than during the period of her maternity leave (Gomez, ECJ). Although not covered by the decision, the same approach should probably be taken to non-statutory leave (such as a sabbatical).