Question: What is the birthdate of this British politician and academic who represents the Liberal Democrats and who co-created the Social Democratic Party in 1981?

Context articles: Shirley Williams
Bob Maclennan, Baron Maclennan of Rogart
Social Democratic Party (UK, 1990–present)
Hungarian-German Social Democratic Party
Social Democratic Party (UK, 1988)
SDP–Liberal Alliance
Liberal Democratic Party (Spain, 1913)
Chief Whip of the Liberal Democrats
Jack Donaldson, Baron Donaldson of Kingsbridge
Croatian parliamentary election, 2003

Shirley Vivian Teresa Brittain Williams, Baroness Williams of Crosby, ("née" Catlin; born 27 July 1930) is a British politician and academic who represents the Liberal Democrats.
 Originally a Labour Member of Parliament (MP) and Cabinet Minister, she was one of the "Gang of Four" rebels who founded the Social Democratic Party (SDP) in 1981.
Robert Adam Ross Maclennan, Baron Maclennan of Rogart, PC, known popularly as Bob Maclennan, (born 26 June 1936, Glasgow) is a British Liberal Democrat life peer.
 He was the last leader of the Social Democratic Party (SDP), serving during the negotiations that led to its merger with the Liberal Party in 1988.
 He then became joint interim leader of the new party, known as the Social and Liberal Democrats (SLD) before later becoming the Liberal Democrats.
The Social Democratic Party is a minor political party in the United Kingdom, established in 1990.
 It traces its origin to the Social Democratic Party that was formed in 1981 by a group of dissident Labour Party Members of Parliament (MPs) and former MPs: Roy Jenkins, David Owen, Bill Rodgers and Shirley Williams, who became known as the "Gang of Four".
 This party merged with the Liberal Party in 1988 to form the Liberal Democrats, but Owen, two other MPs and a minority of party activists formed a breakaway group immediately after with the same name.
 That party dissolved itself in 1990, but some activists met and voted to continue the party in defiance of its National Executive, leading to the creation of a new Social Democratic Party.
The Hungarian-German Social Democratic Party (German: "Ungarisch-Deutsche Partei der Sozialdemokraten" , Hungarian: "Magyar és Német Szociál-Demokrata Párt" ) was a social democratic political party in Slovakia (part of Czechoslovakia at the time).
 It was founded in 1919 by social democrats from ethnic minority communities.
 The party had a German and a Hungarian section.
 The German and Hungarian social democrats in Slovakia had developed an antagonistic relationship with the Slovak social democrats, who had merged into the Czechoslovak Social Democratic Workers Party as Austria-Hungary was broken up after the First World War.
 Issues of contention between Hungarian/German and Slovak social democrats included views of the February Strike of 1919 and the Hungarian Soviet Republic (which the Slovak social democrats considered a threat to their new state).
The Social Democratic Party (SDP) formed in 1988 was a political party in the United Kingdom led by David Owen which lasted for only two years.
 The party was formed as a result of the original Social Democratic Party, created in 1981 by the "Gang of Four" (Owen, Roy Jenkins, Bill Rodgers and Shirley Williams, all dissident Labour former ministers) voting to turn its electoral alliance with the Liberal Party into a full merger of the two parties.
 The new Social and Liberal Democrats (SLD) party thus gained all of the records and assets of the original SDP.
The SDP–Liberal Alliance was a centrist political and electoral alliance in the United Kingdom.
 Formed by the Social Democratic Party (SDP) and the Liberal Party, the Alliance existed from 1981 to 1988, when the two parties merged to form the Social and Liberal Democrats, later renamed the Liberal Democrats.
The Liberal Democratic Party (Spanish: "Partido Liberal Demócrata" , PLD), also known as the Liberal Democrats (Spanish: "Liberal Demócratas" , LD) was a political party led by Manuel García Prieto which split from the Liberal Party in 1913, shortly after the assassination of Prime Minister José Canalejas.
 The Liberal Democrats eventually went on to become the dominant liberal faction in the later stages of Restoration Spain.
This is a list of people who have served as Chief Whip of the Liberal Democrats in the Parliament of the United Kingdom and of its predecessor parties.
 The Liberal Party was formed in 1859, but through its roots in the Whig Party dates back to the late 1670s.
 In 1988, the Liberals merged with the Social Democratic Party, formed by dissident Labour Party members in 1981, to create the Liberal Democrats.
John George Stuart Donaldson, Baron Donaldson of Kingsbridge, OBE (9 October 1907 8 March 1998) was a British politician and public servant.
 He married Frances Lonsdale in 1935.
 He was a soldier, farmer, prison reformer, approved school manager, consumers' champion and was appointed by James Callaghan as Minister for the Arts from 1976 to 1979.
 Before his appointment as Arts Minister, Lord Donaldson served for several years as a Minister of State in the Northern Ireland Office at Stormont.
 He left the Labour Party for the Social Democratic Party (SDP) in 1981, and remained with the Liberal Democrats after the SDP merger with the Liberals.
Parliamentary elections to elect all 151 members of the Croatian Parliament were held on November 23, 2003.
 They were the 5th parliamentary elections to take place since the first multi-party elections in 1990.
 Turnout was 61.7%.
 The result was a victory for the opposition Croatian Democratic Union party (HDZ) which won a plurality of 66 seats, but fell short of the 76 needed to form a government.
 HDZ chairman Ivo Sanader was named the 8th Prime Minister of Croatia on 23 December 2003, after parliament passed a confidence motion in his government cabinet, with 88 Members of Parliament voting in favor, 29 against and 14 abstaining.
 The ruling coalition, consisting of the Social Democratic Party (SDP), Croatian People's Party (HNS), Croatian Peasant Party (HSS), Party of Liberal Democrats (Libra) and the Liberal Party (LS) did not contest the elections as a single bloc.
 Namely, the SDP ran with the Istrian Democratic Assembly (IDS), the Party of Liberal Democrats (Libra) and the Liberal Party (LS), HNS ran with the Alliance of Primorje-Gorski Kotar (PGS) and the Slavonia-Baranja Croatian Party (SBHS), while HSS ran on its own.