Question: Strong Arms of the Ma is the 300th episode to be broadcast though this episode was indicated on-screen to be the 300th episode and aired on what day?

Context paragraphs:
300th Mechanized Regiment (Ukraine): The 300th Guards Mechanized Regiment was a formation of the Ukrainian Ground Forces.  The full name of the regiment is the 300th Separate Guards Mechanized Budapest Regiment.

300th Armored Cavalry Regiment: The 300th Armored Cavalry Regiment (300th ACR) was a Texas-based reconnaissance unit of the United States Army Organized Reserve Corps, which briefly existed after World War II.  It was constituted in 1948 and partially organized from existing units before being inactivated in 1950 and disbanded in 1952.

Grey's Anatomy (season 14): The fourteenth season of the American television medical drama "Grey's Anatomy" was ordered on February 10, 2017, by American Broadcasting Company (ABC), and premiered on September 28, 2017 with a special two-hour premiere.  The season will consist of 24 episodes, with the season's seventh episode marking the 300th episode for the series overall.  The season is produced by ABC Studios, in association with ShondaLand Production Company and The Mark Gordon Company; the showrunner being Shonda Rhimes.

Manga Time: Manga Time (まんがタイム , Manga Taimu ) is a Japanese monthly yonkoma seinen manga magazine published by Hōbunsha since June 1981.  The magazine is released monthly on the seventh.  "Manga Home" is printed as B5 size.  The magazine is sometimes referred to as simply Time (タイム , Taimu ) .  It was created in 1981 by spinning off from Japan's first weekly manga magazine, "Weekly Manga Times", creating Japan's first yonkoma manga magazine.  Its 300th issue was published in 2005, and its longest running series, "Otoboke Kachō" reached its 300th chapter on March 2006.

Strong Arms of the Ma: "Strong Arms of the Ma" is the ninth episode of "The Simpsons"<nowiki>'</nowiki> fourteenth season.  It originally aired on the Fox network in the United States on February 2, 2003.  It is the 300th episode to be broadcast; though "Barting Over" is indicated on-screen to be the 300th episode, it is actually the 302nd.  In the episode, Marge develops agoraphobia in response to a traumatic mugging and overcomes the fear through exercise and bodybuilding, which ultimately leads to her taking anabolic steroids and experiencing a change in personality.

The Simpsons (season 14): "The Simpsons"' fourteenth season was originally broadcast on the Fox network in the United States between November 3, 2002 and May 18, 2003.  The show runner for the fourteenth production season was Al Jean, who executive produced 21 of 22 episodes.  The other episode, "How I Spent My Strummer Vacation", was run by Mike Scully.  The season contains five hold-overs from the previous season's production run.  The fourteenth season has met with mostly positive reviews and won two Primetime Emmy Awards, including Outstanding Animated Program (For Programming less than One Hour), four Annie Awards and a Writers Guild of America Award.  On December 6, 2011, it was released on DVD and Blu-ray in North America.  This season contains the show's 300th episode, "The Strong Arms of The Ma".

300th Rifle Division (Soviet Union): The 300th Rifle Division began service as a standard Red Army rifle division shortly after the German invasion, and fought in the southwestern part of the Soviet-German front for nearly two years following.  It was able to escape the encirclement east of Kiev in September, 1941, and then fought to defend, and later to try to liberate, the city of Kharkov during 1941-42.  After falling back under the weight of the German 1942 summer offensive, the division began distinguish itself during Operation Uranus in late 1942, when it helped defeat the German attempt to relieve Sixth Army and later in the pursuit of the defeated Axis forces and the second liberation of Rostov-na-Donu.  In recognition of these successes it was raised to Guards status as the 87th Guards Rifle Division.  A second 300th Rifle Division was raised a few months later and fought briefly but very successfully against the Japanese in Manchuria in August 1945.  The second formation became the 3rd Tank Division in the Far East postwar and was redesignated as the 46th Tank Division in 1957 before disbanding in 1959.

The Shrine (Stargate Atlantis): "The Shrine" is the 86th of the science fiction television series "Stargate Atlantis" and is the sixth episode in its fifth season.  The episode is also the 300th produced episode in the overall Stargate franchise.  The episode first aired on August 22, 2008 on the Sci Fi Channel in the United States, and subsequently aired on October 23 on Sky1 in the United Kingdom.  The episode was nominated for a Nebula Award, and a further four Leo Awards.

Three Choirs Festival: The Three Choirs Festival is a music festival held annually at the end of July, rotating among the cathedrals of the Three Counties (Hereford, Gloucester and Worcester) and originally featuring their three choirs, which remain central to the week-long programme.  The large-scale choral repertoire is now performed by the Festival Chorus, but the festival also features other major ensembles and international soloists.  The 2011 festival took place in Worcester from 6 to 13 August.  The 2012 festival in Hereford took place earlier than usual, from 21 to 28 July, to avoid clashing with the 2012 Summer Olympics.  The event is now established in the last week of July.  The 300th anniversary of the original Three Choirs Festival was celebrated during the 2015 festival, which took place from 25 July to 1 August in Hereford (the landmark 300th meeting of the Three Choirs does not fall until 2027 due to there being no Three Choirs Festivals for the duration of both WW1 and WW2).

Barting Over: "Barting Over" is the eleventh episode of the fourteenth season of "The Simpsons", advertised by Fox, and indicated on-screen to be the 300th episode of the show (though in broadcast order, it is the 302nd episode, as noted in the episode proper).  It originally aired on the Fox network in the United States on February 16, 2003.  In this episode, Bart discovers that he used to be a child star in commercials—and that Homer spent all the money he earned.  In retaliation, Bart petitions the court to be legally emancipated, and he moves out of the house.

Supporting paragraphs: Strong Arms of the Ma Barting Over
Answer: February 16, 2003