Question: When did the American comedy-drama television series which its consisted of 12 episodes premiered 

Context paragraphs:
Shameless (season 3): The third season of "Shameless", an American comedy-drama television series based on the award-winning British series of the same name by Paul Abbott, premiered on January 13, 2013, at Sunday 9:00 p.m. EST on the Showtime television network.  Executive producers are John Wells, Paul Abbott and Andrew Stearn, with producer Michael Hissrich.  The season concluded after 12 episodes on April 7, 2013.  The shows season premiere brought in 2.00 million viewers, becoming the show highest rated episode ever to-date.  The episode airing February 17, "The Sins of My Caretaker", received 1.31 million total viewers, its lowest rated episode of the season.  The season finale scored 1.82 million viewers.

Shameless (season 4): The fourth season episode 10 of "Shameless", an American comedy-drama television series based on the award-winning British series of the same name by Paul Abbott, premiered on January 12, 2014, at Sunday 9:00 p.m. EST on the Showtime television network.  Executive producers are John Wells, Paul Abbott and Andrew Stearn, with producer Michael Hissrich.  The season concluded after 12 episodes on April 6, 2014.  The shows season premiere brought in 1.69 million viewers, while the episode airing February 2, "Strangers on a Train", received 1.22 million total viewers, its lowest rated episode of the season.  The season finale scored 1.93 million viewers, becoming the show highest rated episode for the season.

Shameless (season 1): The first season of "Shameless", an American comedy-drama television series based on the award-winning British series of the same name by Paul Abbott, premiered on January 9, 2011, at Sunday 10:00 p.m. EST on the Showtime television network.  Executive producers are John Wells, Paul Abbott and Andrew Stearn, with producer Michael Hissrich.  The season concluded after 12 episodes on March 27, 2011.  The shows season premiere was watched by 982,000 viewers, making it the network's biggest turnout for a series premiere since "Dead Like Me" in 2003.  The episode airing January 30, "Casey Casden", received 1.45 million total viewers, making "Shameless" the best performing first-year drama on Showtime.  The season finale scored 1.16 million viewers.

List of Younger episodes: "Younger" is an American comedy-drama television series that premiered on March 31, 2015, on TV Land.  Based on the Pamela Redmond Satran novel of the same name, "Younger" was created by Darren Star, and stars Sutton Foster in the lead role of Liza Miller, a 40-year-old recently divorced mother who, after finding it difficult to get a job at her age, attempts to pass herself off as a 26-year-old in order to start her life over.  Hilary Duff, Debi Mazar, Miriam Shor, Nico Tortorella, Molly Bernard and Peter Hermann also star in supporting roles.  On April 21, 2015, "Younger" was renewed for a second season of 12 episodes, which premiered in January 2016.  On January 6, 2016, "Younger" was renewed for a third season of 12 episodes, which aired on September 28, 2016.

Younger (season 3): Younger is an American single-camera comedy-drama television series based on the Pamela Redmond Satran novel of the same name, created and produced by Darren Star.  The series stars Sutton Foster as the lead character, with Debi Mazar, Miriam Shor, Nico Tortorella, Hilary Duff, Molly Bernard and Peter Hermann co-starring in other main roles.  The pilot was picked up for a series in April 2014, with a 12-episode order.  The first season consisted of 12 episodes, premiering on March 31, 2015 at 10 pm Eastern time.

The Checkout: The Checkout is an Australian consumer affairs television series.  The show's first series of 10 episodes premiered on 21 March 2013 on the Australian Broadcasting Corporation (ABC) television station ABC TV.  A second series consisting of 16 episodes commenced airing on 20 February 2014.  On 9 April 2015, a third series consisting of 12 episodes began airing.  The series was renewed for a fourth series, which began airing on 7 April 2016 consisting of 12 episodes.  The series returned for a fifth series, airing twelve episodes between 6 April 2017 and 29 June 2017.

List of The Almighty Johnsons episodes: "The Almighty Johnsons" is a New Zealand fantasy comedy-drama television series, which was created by James Griffin and Rachel Lang and is produced by South Pacific Pictures.  It began airing its first series of ten episodes in New Zealand on 7 February 2011.  The second series of 13 episodes began broadcasting on 29 February 2012.  A third series of 13 episodes premiered on 4 July 2013.

Younger (season 1): The first season of the American comedy-drama television series "Younger" premiered on March 31, 2015, on TV Land.  Starring Sutton Foster in the lead role of Liza Miller, the season consisted of twelve episodes and concluded its initial broadcast on June 9, 2015.

Shameless (season 5): The fifth season of "Shameless", an American comedy-drama television series based on the award-winning British series of the same name by Paul Abbott, premiered on January 11, 2015 on the Showtime television network.  Executive producers are John Wells, Paul Abbott and Andrew Stearn, and producer Michael Hissrich.  Like all previous seasons, the season consisted of 12 episodes.

Shameless (season 2): The second season of "Shameless", an American comedy-drama television series based on the award-winning British series of the same name by Paul Abbott, premiered on January 8, 2012, at Sunday 9:00 p.m. EST on the Showtime television network.  Executive producers are John Wells, Paul Abbott and Andrew Stearn, with producer Michael Hissrich.  The season concluded after 12 episodes on April 1, 2012.  The shows season premiere brought in 1.58 million viewers, which was higher than the season 1 premiere.  The episode airing March 4, "Parenthood", received 1.6 million total viewers, its highest rated show of the season.  The season finale scored 1.45 million viewers.

Supporting paragraphs: Younger (season 3) Younger (season 1)
Answer: March 31, 2015