Question: When did the office held by Donald Tsang from 2005 to 2012 come into being?

Context paragraphs:
Tsang Yam-pui: TSANG Yam-pui, {'1': ", '2': ", '3': 'GBS, OBE', '4': "} (, born 1946) is the brother of Chief executive Donald Tsang.  He was the Commissioner of Police of Hong Kong from January 2001 to December 2003.  Their high positions in the government has referred both of them as the "Two high officials".  His father was also a Hong Kong Police officer.

Donald Tsang: Donald Tsang Yam-kuen {'1': ", '2': ", '3': ", '4': "} (; born 7 October 1944) is a former Hong Kong civil servant and the second Chief Executive of Hong Kong from 2005 to 2012.

4th Legislative Council of Hong Kong: The Fourth Legislative Council of Hong Kong was the last meeting of the legislative branch of the Hong Kong Special Administrative Region Government.  The membership of the LegCo is based on the 2008 election.  The term of the session is from 1 October 2008 to 30 September 2012, during the second half of the Donald Tsang's administration and first two months of the Leung Chun-ying's term in office.  The meeting place was moved from the Legislative Council Building to the new built Legislative Council Complex in 2011.  The Democratic Alliance for the Betterment and Progress of Hong Kong remained the largest party with 10 seats.  Notable newcomers to the Legislative Council included Regina Ip, Priscilla Leung, Wong Yuk-man, Tanya Chan, and Paul Tse.

3rd Legislative Council of Hong Kong: The Third Legislative Council of Hong Kong was the meeting of the legislative branch of the Hong Kong Special Administrative Region Government.  The membership of the LegCo is based on the 2004 election.  The term of the session was from 1 October 2004 to 30 September 2008, during the second half of the Tung Chee-hwa's administration until his resignation in 2005 and was replaced by Donald Tsang for the rest of the term, and also the beginning of the third term of Chief Executive after Tsang won in the 2007 Election.  The Democratic Alliance for the Betterment of Hong Kong (DAB) became the largest party with 10 seats (not including the two DAB members who ran under the Hong Kong Federation of Trade Unions banner).  Notable newcomers to the Legislative Council included Leung Kwok-hung, Alan Leong, Ronny Tong, Albert Cheng, and Jeffrey Lam.

AsiaWorld–Expo: The AsiaWorld–Expo is one of the two major convention and exhibition facilities in Hong Kong along with Hong Kong Convention and Exhibition Centre.  It was opened on 21 December 2005 by Donald Tsang, Chief Executive of Hong Kong, and it is operated by AsiaWorld–Expo Management Limited.  It is located on Chek Lap Kok island, next to Hong Kong International Airport.

Lau Kong-wah: Lau Kong-wah, JP (born 22 June 1957, Hong Kong), also called Ray Lau, is a former member of the Legislative Council of Hong Kong.  On 14 October 2008, Donald Tsang, the Chief Executive of Hong Kong, made Lau a member of the Executive Council of Hong Kong, filling the vacancy left by the resignation of Jasper Tsang upon the latter becoming President of the Legislative Council of Hong Kong.  By the end of June 2012, Lau ceased to be a member of the Executive Council of Hong Kong.

Hong Kong Chief Executive election, 2005: The 2005 Hong Kong Chief Executive election was held to fill the vacancy of the territory's top office.  Then Chief Executive Tung Chee-hwa submitted his resignation to the central government in Beijing, and was officially approved on 12 March.  As Donald Tsang, Chief Secretary for Administration in Tung's cabinet, was the only candidate, he was declared elected unopposed on 16 June.  Tsang took office on 21 June to begin his first two-year term.

Chief Executive of Hong Kong: The Chief Executive of the Hong Kong Special Administrative Region is the head and representative of the Hong Kong Special Administrative Region and head of the Government of Hong Kong.  The position was created to replace the Governor of Hong Kong, the representative of the Monarch of the United Kingdom during British rule.  The office, stipulated by the Hong Kong Basic Law, formally came into being on 1 July 1997 when the sovereignty of Hong Kong was transferred from the United Kingdom to the People's Republic of China.

Community Care Fund: Community Care Fund () was suggested by Donald Tsang Yum-kuen, who was the Chief Executive of Hong Kong from 2005-2012, in the 2011 Policy address of Hong Kong.

Hong Kong Chief Executive election, 2007: The 2007 Hong Kong Chief Executive election was held on 25 March 2007 to select the Chief Executive of Hong Kong.  Incumbent Chief Executive Donald Tsang was re-elected, defeating the pro-democracy challenger, legislator Alan Leong of the Civic Party by 649 to 123 votes in the 796-member Election Committee dominated by the pro-Beijing electors.

Supporting paragraphs: Donald Tsang Chief Executive of Hong Kong
Answer: 1 July 1997