Arbeitszeitgesetz
Dimas served briefly in the Prodi Commission. He was appointed European Commissioner for Employment and Social Affairs in March 2004, taking over the role from the previous Greek Commissioner Anna Diamantopoulou. A major focus of his work during this time involved making it more difficult for states to opt out of the Working Time Directive. The Greek government nominated Dimas for the incoming Barroso Commission which took office on 22 November 2004.