Hartling was Prime Minister from 19 December 1973 until 13 February 1975, when Anker Jørgensen and the Social Democrats came to power again.
Hartling menjadi Perdana Menteri dari 18 Desember 1973 sampai 13 Februari 1975, saat Anker Jørgensen dan Demokrat Sosial berkuasa kembali.