Question: When did the newspaper, of which David Dinsmore is a former editor, become a tabloid ?

Context paragraphs:
The Oakland Post (Michigan): The Oakland Post is a weekly newspaper published in Oakland County, Michigan.  It is a student-run, independent newspaper serving Oakland University.  It is owned by the Oakland Sail, Inc.  The current editor-in-chief is Paige Brockway.  Kristen Davis preceded Brockway, serving as editor from fall 2015 through spring 2016.  Kaylee Kean served as editor summer 2015.  Oona Goodin-Smith served as editor from summer 2014 through spring 2015.  Scott Wolchek served as editor from summer 2013 to spring 2014.  Former editor Nichole Seguin served from the winter of 2011 through the spring of 2013.  Kay Nguyen served as editor from the 2010 spring semester through the 2011 fall semester.  The 2009–10 editor-in-chief was Colleen Miller.

Dagen (Norwegian newspaper): Dagen is a Norwegian Christian newspaper established in 1919, and published in Bergen.  The average circulation in 2004 was 5,307 copies.  The ideological goal of the newspaper was "to influence society from a revival Christian point of view".  On 1 January 2008 the newspaper merged with another Christian newspaper, "Magazinet" and was renamed to "DagenMagazinet".  On 1 April 2011 "DagenMagazinet" was renamed to "Dagen".  The current chief editor of "Dagen" is Vebjørn Selbekk, former editor of "Magazinet".

David Dinsmore (editor): David Dinsmore (born 2 September 1968) is a Scottish newspaper executive and a former editor of "The Sun" newspaper.  Dinsmore grew up in Glasgow, and began working for News International at the age of 22.

Martin Newland: Martin Newland (born 26 October 1961) is a British journalist, a former Editor of The Daily Telegraph who now consults on media and communications, most recently in the Middle East.  He was an advisor to Abu Dhabi Media and before that was Executive Director Publishing, Abu Dhabi Media.  Prior to that, he was launch Editor of "The National", a national newspaper in Abu Dhabi.  Before that, he was editor of "The Daily Telegraph", a British broadsheet newspaper, from 2003–2005, replacing Charles Moore.  Newland was appointed Editor upon his return from Canada where he was a launch editor and Deputy Editor of Conrad Black's new national newspaper The National Post.  The launch of the Post started one of the most costly and intense newspaper wars in North America.

John Heidenry: John Heidenry is an author and editor who was born in St. Louis, Missouri.  He is the former editor of "St. Louis" magazine and the founder of the "St. Louis Literary Supplement".  He is also the former editor of "Penthouse Forum", the former interim editor of "Maxim" magazine, and the former executive editor of "The Week".  Heidenry is the author of "Theirs Was The Kingdom: Lila and DeWitt Wallace & the Story of the Reader's Digest" (W W Norton, 1993), "What Wild Ecstasy: The Rise and Fall of the Sexual Revolution" (Simon & Schuster, 1997), "The Gashouse Gang: How Dizzy Dean, Leo Durocher, Branch Rickey, Pepper Martin, and Their Colorful, Come-from-Behind Ball Club Won the World Series-and America's Heart-During the Great Depression" (Public Affairs, 2007), "Zero at the Bone: The Playboy, the Prostitute, and the Murder of Bobby Greenlease" (St. Martin's Press, 2009), and the co-author, with Brett Topel, of "The Boys Who Were Left Behind: The 1944 World Series between the Hapless St. Louis Browns and the Legendary St. Louis Cardinals" (University of Nebraska Press, 2006).

Jerry Needam: Jerry Needam (born 2 March 1966) is a journalist, newspaper publisher and politician from Rivers State, a reverend and diocesan media communicator of the Christ Army Church of Nigeria (CACN), former editor of the Ogoni Star newspaper, and owner of the Nigerian weekly tabloid National Network.  He is Special Adviser on Media and Publicity to Felix A. Obuah, the Rivers State People's Democratic Party chairman.  He is also a former Spokesperson of the Action Congress of Rivers State.

Agron Bajrami: Agron Bajrami (born 5 December 1967 in Pristina, Kosovo, is editor of and a writer for "Koha Ditore" (English: Daily Time) newspaper, the largest daily newspaper in Kosovo.  He filled various journalistic and editing positions at the newspaper since its establishment in 1997, and took over as editor in chief in September 2004 after its former editor and publisher, Veton Surroi, departed for politics.

Bhikkhu Cintita: Bhikkhu (Bhante) Cintita Dinsmore (born "John David Dinsmore"; 1949 in San Francisco), is an American Buddhist monk, ordained in Burma and currently teaching in the cities of Minneapolis, Minnesota and Austin, Texas.

The Sun (United Kingdom): The Sun is a tabloid newspaper published in the United Kingdom and Ireland.  Since "The Sun on Sunday" was launched in February 2012, the paper has been a seven-day operation.  As a broadsheet, it was founded in 1964 as a successor to the "Daily Herald"; it became a tabloid in 1969 after it was purchased by its current owners.  It is published by the News Group Newspapers division of News UK, itself a wholly owned subsidiary of Rupert Murdoch's News Corp.

Gareth Morgan (editor): Gareth Morgan is a former editor of UK tabloid newspaper the "Daily Star Sunday".

Supporting paragraphs: David Dinsmore (editor) The Sun (United Kingdom)
Answer: 1969