Question: When did the sixth season premiere of the show whose 12th episode of that season is called "False Positive"?

full_context: Document 1: What Is... Cliff Clavin?: "What Is... Cliff Clavin?" is an eighth season episode of the American television series "Cheers". It was directed by Andy Ackerman rather than James Burrowswho directed 243 out of 273 episodes of the showand originally aired January 18, 1990 on NBC. In this episode, Cliff Clavin (John Ratzenberger) appears on the game show "Jeopardy!" and game show host Alex Trebek guest stars as himself. Cliff racks up US$ during the game but loses it all in the final round, and he unsuccessfully demands that his answer be accepted. Back at Cheers, Trebek encounters Cliff and announces his resignation from the game show, prompting Cliff to reconsider. Unbeknownst to Cliff, Trebek did that mainly to avoid him. Meanwhile, Sam retrieves his address book from a teenage boy Timmy, who repeatedly calls Sam's past dates, and ironically encourages Timmy to stick to girls around his age. The episode received praise from critics for its concept and its guest star.
Document 2: List of How I Met Your Mother episodes: "How I Met Your Mother" is an American sitcom written and created by Carter Bays and Craig Thomas. It was first aired on September 19, 2005 on CBS with a thirty-minute pilot episode, and finished its planned nine-year run on March 31, 2014 after 208 episodes. Set in present-day Manhattan, the series follows the social and romantic lives of Ted Mosby (Josh Radnor) and his four best friends, Marshall Eriksen (Jason Segel), Robin Scherbatsky (Cobie Smulders), Lily Aldrin (Alyson Hannigan), and Barney Stinson (Neil Patrick Harris), as Ted seeks out his future wife (Cristin Milioti). The show tells this story through the framing device of "future" Ted (Bob Saget) as an unreliable narrator who is recounting to his son and daughter the events that led him to their mother. In Seasons 1–8, episodes are typically set to a similar timeline as its real-world airdate, with the season finale generally taking place in the spring and the next season premiere in the fall, usually with a quick recap of the events that took place during the summer. The final season (season 9) deviates from this format by taking place immediately after the end of the previous season and encompassing only the weekend of Barney's and Robin's wedding. The series finale covers several years that follow.
Document 3: Shareholder Meeting: "Shareholder Meeting" is the 11th episode of the sixth season of the U.S. comedy series "The Office" and the show's 111th episode overall. It was written by Justin Spitzer and directed by Charles McDougall, and originally aired in the United States on NBC on November 19, 2009.
Document 4: How I Met Your Mother (season 9): The ninth and final season of "How I Met Your Mother", an American sitcom created by Carter Bays and Craig Thomas, premiered on CBS on September 23, 2013, with two episodes, and concluded on March 31, 2014. The show was renewed for the final season on December 21, 2012, after cast member Jason Segel changed his decision to leave the show after Season 8. Cristin Milioti, who was revealed as "The Mother" in the Season 8 finale, was promoted to a series regular, the only time "How I Met Your Mother" added a new regular cast member. Season 9 consists of 24 episodes, each running approximately 22 minutes in length.
Document 5: Canadian Idol (season 6): The sixth and final season of "Canadian Idol" is the sixth and final installation of the "Idol" series in Canada and premiered on June 3, 2008, on the CTV Television Network. It is again hosted by Ben Mulroney, with the addition of Jully Black as a special correspondent and general mentor to the contestants. Farley Flex, Jake Gold, Sass Jordan and Zack Werner all returned as judges. This season saw a number of major and minor show format changes in an effort to keep the franchise fresh and innovative. The final episode of the season, in which the Canadian Idol was crowned, aired on September 10, 2008. The winner of the sixth season was Theo Tams. The sixth season became the final season of "Canadian Idol" following its cancellation in 2009.
Document 6: How I Met Your Mother (season 1): The first season of "How I Met Your Mother", an American sitcom created by Carter Bays and Craig Thomas, premiered on CBS in the United States on September 19, 2005 and concluded on May 15, 2006. The season was directed by Pamela Fryman and produced by Bays & Thomas Productions and 20th Century Fox Television. It consists of 22 episodes, each running approximately 22 minutes in length.
Document 7: Landmarks (How I Met Your Mother): "Landmarks" is the 23rd episode of the sixth season of the CBS sitcom "How I Met Your Mother" and the 135th episode overall. It aired on May 9, 2011.
Document 8: Pilot (How I Met Your Mother): The pilot episode of the American television sitcom "How I Met Your Mother" premiered on CBS on September 19, 2005. It was written by series creators Carter Bays and Craig Thomas, and directed by Pamela Fryman The pilot takes place in 2030, as a future Ted Mosby (Voiced by Bob Saget) is telling his kids the story of how he met their mother. It flashes back to 2005 to a younger Ted (Josh Radnor) who meets Robin Scherbatsky (Cobie Smulders), a reporter who he becomes smitten for. Meanwhile, Ted's lawyer friend Marshall Eriksen (Jason Segel) plans on proposing to his girlfriend Lily Aldrin (Alyson Hannigan), a kindergarten teacher.
Document 9: How I Met Your Mother (season 6): The sixth season of the American television comedy series "How I Met Your Mother" premiered on September 20, 2010, and concluded on May 16, 2011 on CBS.
Document 10: False Positive (How I Met Your Mother): "False Positive" is the 12th episode of the sixth season of the CBS sitcom "How I Met Your Mother", and the 124th episode overall. It aired on December 13, 2010. It features guest star Alex Trebek.
Document 11: The Pineapple Incident: "The Pineapple Incident" is the tenth episode in the first season of the television series "How I Met Your Mother". It originally aired on November 28, 2005. It is the highest viewed episode in season 1 and the second highest overall episode during the nine seasons of "How I Met Your Mother". It is widely considered of the best episodes in the entire series.
Document 12: Treehouse of Horror XVI: "Treehouse of Horror XVI" is the fourth episode of the seventeenth season of "The Simpsons". It first aired on the Fox network in the United States on November 6, 2005. In the sixteenth annual "Treehouse of Horror", the Simpsons replace Bart with a robot son after Bart falls into a coma, Homer and various other male characters find themselves on a reality show where Mr. Burns hunts humans for sport, and costumed Springfieldians become whatever they are wearing, thanks to a witch who was disqualified from a Halloween costume contest. It was written by Marc Wilmore and directed by David Silverman. Terry Bradshaw and Dennis Rodman guest star as themselves. Around 11.63 million Americans tuned in to watch the episode during its original broadcast.
Document 13: How I Met Your Mother (season 8): The eighth season of the American television comedy series "How I Met Your Mother" was announced in March 2011 along with confirmation of the seventh season. The season premiered on September 24, 2012 and concluded on May 13, 2013.
Document 14: List of How I Met Your Mother characters: The American sitcom "How I Met Your Mother" premiered on CBS on September 19, 2005. Created by Craig Thomas and Carter Bays, the show is presented from the perspective of Ted Mosby in 2030 ("Future Ted") as he tells his children how he met the titular mother. The show lasted for nine seasons and 208 episodes; the finale first aired on March 31, 2014.
Document 15: The Apprentice (U.S. season 13): The Celebrity Apprentice 6 (also known as All-Star Celebrity Apprentice or The Apprentice 13) is the sixth installment of the reality game show, "Celebrity Apprentice", which premiered on Sunday, March 3, 2013. This season's cast is an "All-Star" celebrity cast, bringing back many fan favorites to compete head-to-head. There are eight men and six women in the cast. Brande Roderick, Claudia Jordan, Dennis Rodman, La Toya Jackson, Lil Jon, Omarosa Manigault and the only previous winner, Bret Michaels formed team Power and team Plan B was formed by Dee Snider, Gary Busey, Lisa Rinna, Marilu Henner, Penn Jillette, Stephen Baldwin and Trace Adkins. This marked Omarosa's third appearance on "The Apprentice", more than any other contestant. Also appearing as guest judges are past winners Joan Rivers, Piers Morgan, Arsenio Hall and John Rich, along with past judge George Ross, as well as Ivanka Trump, Eric Trump, and Donald Trump Jr. This season also introduced the Social Boardroom MVP reward. Viewers went on Twitter to select the celebrity they think did best in the task. The celebrity who received the most votes won additional money for their charity. This season premiered on March 3, 2013.
ground_truth: September 20, 2010