Question: when was the actor revealed as "The Mother" in the Season 8 finale in  How I Met Your Mother born 

Context articles: List of How I Met Your Mother episodes
Cristin Milioti
George Hammond (Stargate)
Peter Benton
How I Met Your Music
Season 8 Favorite Performances
Roman Waschuk
How I Met Your Mother (season 9)
Morgan Taylor Reid
Bigg Boss Halla Bol

"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.
Cristin Milioti (born August 16, 1985) is an American actress and singer.
 She is known for her work in Broadway theatre productions such as "That Face", "Stunning", and the Tony Award-winning musical "Once".
 She is also known for playing Tracy McConnell, the titular mother, on the sitcom "How I Met Your Mother" from 2013 to 2014, and Teresa Petrillo Belfort in the 2013 film "The Wolf of Wall Street".
 She has won a Grammy Award and has been nominated for a Tony Award.
Lieutenant General George S. Hammond, USAF (Ret.)
 is a fictional character in the "Stargate franchise".
 Played by American actor Don S. Davis, General Hammond serves as the commander of Stargate Command (SGC) in the first seven seasons of the television series "Stargate SG-1".
 He is relieved of command in the series' season 7 finale "Lost City", but becomes head of the new Homeworld Security department at the beginning of season 8.
 Hammond's off-screen retirement is confirmed in "SG-1"' s season 10, and the character's death is mentioned in the series finale of "SG-1"' s spin-off series "Stargate Atlantis", "Enemy at the Gate".
Dr. Peter Benton is a fictional character that was a regular on the television series "ER" for its first eight seasons and appeared in two episodes of the show's final season.
 He was played by Eriq La Salle.
 Benton was often portrayed as arrogant and irritable, but is nevertheless an exceptionally talented surgeon who is passionate about medicine.
 It is also revealed that he and fellow emergency room physician Mark Greene had attended medical school together.
 Benton's last appearance as a series regular was in the Season 8 episode "I'll Be Home For Christmas".
 La Salle's removal from the opening credits as an ongoing regular was in the 11th episode of season 8; however, Benton appeared in the credits of the 15th episode of season 8, in which he is shown talking to Elizabeth Corday, and the 21st episode, in which he appears at Mark Greene's funeral.
 He also appears later in season 15.
How I Met Your Music is the name of two albums (the first being followed by the subtitle (Original Songs from the Hit Series "How I Met Your Mother"), the second being followed by Deluxe) composed of songs from the CBS television series "How I Met Your Mother", the first of which was released hours before the Season 8 premiere.
 It features 20 songs that had appeared in the first seven series on the show and was released only digitally, originally through iTunes.
 A second iteration, titled "How I Met Your Music: Deluxe" album, was released a year later.
 It contains an entirely different play list.
 Many critics have said that the albums reflect the series' consistently effective use of music.
Season 8 Favorite Performances is a compilation album by American singer Adam Lambert based on his "American Idol" performances.
 The album was released digitally through iTunes and consists of studio recordings made by Lambert during season 8 of "American Idol".
 It does not include live performances at the Nokia Theater in Los Angeles.
 A similar album was also released through iTunes by season 8 winner Kris Allen.
 It sold 16,000 on its first week, and has sold 35,000 by July 23, 2009.
Roman Waschuk (also Roman Vashchuk, ukr.: Роман Ващук), (born 1962 in Toronto, Ontario), ethnic Ukrainian, Canadian diplomat, Ambassador of Canada to Ukraine.
 His parents immigrated after the Second World War to Canada.
 His father was born in Ivano-Frankivsk, his mother born in Buchach.
 He studied history with focus on Central and Eastern Europe, also German and Russian, receiving 1985 a MA at University of Toronto.
 He worked for the Commission of Inquiry on War Criminals Juli 1985 – December 1986, Providing background information to investigators and counsel on WW2-era events in Central, Eastern and Southern Europe.
 He is fluent in English, French, German, Russian, Ukrainian, Polish and Serbian.
 He was member of the Ukrainian Scouting organization "Plast" in Canada.
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.
Morgan Taylor Reid (born November 1, 1985) is an American musician, singer-songwriter, recording artist and record producer based in Los Angeles.
 As an artist, Reid's music has been licensed for television including his song "Brighter" that was featured in the Season 7 finale of "Grey's Anatomy", his song "Simply Human" featured on "House" (Season 8, Episode 9 FOX) and his song "Where Do I Even Start?"
 featured in Season 8, Episode 8 of "Grey's Anatomy".
 After being featured on "Grey's Anatomy", "Where Do I Even Start?"
 reached #74 on the Top 100 Alternative Songs on iTunes.
Bigg Boss Halla Bol is the spin-off of the Indian reality television show "Bigg Boss".
 It was a merger of "Bigg Boss 8" similarly to the concept adopted by the "Ultimate Big Brother".
 Five contestants from previous seasons enters the house to compete with five crowned regular entrants of the season 8 finale.
 Farah Khan host the new format of the show, as Salman bids adieu to the show because of his filming schedule of "Bajrangi Bhaijaan" .