Table:
text: Prime Minister of Iceland
Prime Ministers of Iceland (1917–present)
Prime Ministers of Iceland (1917–present)
Entered_office Left_office Party Election Coalition
21 October 1944 4 February 1947 Independence Party Oct. 1942 IP — SDP — SP
21 October 1944 4 February 1947 Independence Party 1946 IP — SDP — SP
4 February 1947 6 December 1949 Social Democratic Party 1946 SDP — IP — PP
6 December 1949 14 March 1950 Independence Party 1949 IP
14 March 1950 11 September 1953 Progressive Party 1949 PP — IP
11 September 1953 24 July 1956 Independence Party 1953 IP — PP
24 July 1956 23 December 1958 Alliance Progressive Party 1956 Alliance PP — SDP — PA
23 December 1958 20 November 1959 Social Democratic Party Jun. 1959 SDP

Question: When was the party elected in June? 1959 took office as Prime Minister of Iceland ?