After Lamont was sacked, Cameron remained at the Treasury for less than a month before being specifically recruited by Home Secretary Michael Howard. It was commented that he was still "very much in favour" and it was later reported that many at the Treasury would have preferred Cameron to carry on. At the beginning of September 1993, Cameron applied to go on Conservative Central Office's list of Prospective Parliamentary Candidates.  Cameron was much more socially liberal than Howard but enjoyed working for him. According to Derek Lewis, then Director-General of Her Majesty's Prison Service, Cameron showed him a "his and hers list" of proposals made by Howard and his wife, Sandra. Lewis said that Sandra Howard's list included reducing the quality of prison food, although Sandra Howard denied this claim. Lewis reported that Cameron was "uncomfortable" about the list. In defending Sandra Howard and insisting that she made no such proposal, the journalist Bruce Anderson wrote that Cameron had proposed a much shorter definition on prison catering which revolved around the phrase "balanced diet", and that Lewis had written thanking Cameron for a valuable contribution.  During his work for Howard, Cameron often briefed the media. In March 1994, someone leaked to the press that the Labour Party had called for a meeting with John Major to discuss a consensus on the Prevention of Terrorism Act. After an inquiry failed to find the source of the leak, Labour MP Peter Mandelson demanded assurance from Howard that Cameron had not been responsible, which Howard gave. A senior Home Office civil servant noted the influence of Howard's Special Advisers, saying previous incumbents "would listen to the evidence before making a decision. Howard just talks to young public school gentlemen from the party headquarters."

Answer this question "When did David start that position?" by extracting the answer from the text above.
After Lamont was sacked, Cameron remained at the Treasury for less than a month before being specifically recruited by Home Secretary Michael Howard.