Title: Law &amp; Order: Special Victims Unit (season 1)
Content:  The first season of Law & Order: Special Victims Unit, premiered on September 20, 1999 on NBC and concluded on May 19, 2000. Created by Dick Wolf, it is the first spin-off of Law & Order and follows the detectives of a fictionalized version of the New York City Police Department's Special Victims Unit, which investigates sexually based offenses. SVU originally aired on Monday nights at 9pm/8c EST, but it was moved to Friday nights at 10pm/9c after the ninth episode. Showrunner Robert Palm felt too disturbed by the subject matter and left after the season's conclusion.
Title: Law &amp; Order: Special Victims Unit (season 18)
Content:  The eighteenth season of Law & Order: Special Victims Unit debuted on Wednesday, September 21, 2016, on NBC and finished on Wednesday, May 24, 2017, with a two-hour season finale. Rick Eid, who previously worked on Law & Order and Law & Order: Trial by Jury, became the executive producer and showrunner, following Warren Leight's departure from the series at the conclusion of the seventeenth season. Eid himself departed the series at the end of the eighteenth season and was replaced by Michael S. Chernuchin.
Title: Law &amp; Order: Special Victims Unit
Content:  Law & Order: SVU airs on NBC in the United States. With the season eleven premiere on September 23, 2009, the series vacated its Tuesday 10 p.m. ET slot because NBC began a prime-time weeknight Jay Leno series. The new time slot became Wednesday nights at 9:00 p.m. ET on NBC, with CTV still airing SVU on Tuesdays at 10:00 in Canada. After the 2010 Winter Olympics on March 3, 2010, the time slot for SVU changed again to Wednesdays at 10 p.m. ET, where it stayed until the twelfth season. In the 12th season, SVU moved back to 9:00 p.m. to lead in the newest Law & Order spin-off, Law & Order: LA, until it 
Title: Law &amp; Order: Special Victims Unit (season 18)
Content:  Law & Order: Special Victims Unit was renewed for an eighteenth season on February 1, 2016, by NBC. It was announced in March 2015 that season seventeen would be showrunner/executive producer Warren Leight's last season on the show; he signed a three-year deal with Sony Pictures Television, his contract allowing him to work on SVU for one final season. On March 10, 2016, it was announced that Rick Eid would replace Leight as showrunner on this season. The 400th episode of the series aired this season. "Motherly Love," directed by Mariska Hargitay, was filmed and billed as the 400th show. However, due to the shuffling of episodes during the season, the episode actually aired as the 399th episode. The 400th episode that was aired was 
Title: Law &amp; Order: Special Victims Unit (season 20)
Content:  The twentieth season of Law & Order: Special Victims Unit premiered on Thursday, September 27, 2018, at 9PM ET with a two-part premiere episode. The following Thursday, the series started airing new episodes at 10PM ET. The season ended on May 16, 2019. This landmark season of SVU tied it with both the original Law & Order series and Gunsmoke as longest-running scripted non-animated U.S. primetime TV series. On March 29, 2019, as it was announced that SVU was renewed for a twenty-first, record-breaking season, it was also announced this season would be the last season to feature Philip Winchester.
Title: Law &amp; Order: Special Victims Unit
Content:  pulled from the network in January 2011 to be retooled. SVU moved back to 10:00 p.m. on January 12, 2011, until the end of the 13th season. With season 14, SVU moved back to 9:00 p.m. after a two-hour season premiere event on September 26, 2012. Beginning with Season 20, SVU would air on Thursday nights at 10 p.m., after NBC decided to devote their entire Wednesday primetime lineup to the Chicago Med, PD, and Fire trilogy. It marked the first time ever that Law & Order: SVU would hold this timeslot on Thursday nights. Starting with season 22, the show moved to 9 p.m., with offshoot Law & Order: Organized Crime taking its old slot.
Title: Law &amp; Order (franchise)
Content: 23 seasons, 503 episodes (September 20, 1999 – present) SVU follows the cases investigated by NYPD Captain Olivia Benson (Mariska Hargitay) and her Manhattan Special Victims Unit colleagues. The show's focus is on detectives who investigate sexually based crimes and crimes against children, the elderly, and the disabled. At the start of season twenty-two, these detectives included characters portrayed by Kelli Giddish, Ice-T and Octavio Pisano, while Peter Scanavino co-stars. Season twenty-three premiered on September 21, 2021. In February 2020, the series was renewed through the 24th season.
Title: Law &amp; Order (season 19)
Content:  The 19th season of Law & Order premiered on NBC on November 5, 2008, and concluded on June 3, 2009. This was the third time in the series where there were no changes in the cast from the previous season and the last season to air on Wednesday nights at 10PM/9c, Law & Order: Special Victims Unit has claimed the slot off-and-on (SVU often placed at 9PM/8c to lead other programming that later gets moved or taken off schedule) from Fall 2009 to present. The series had a decline in the ratings from being in competition with CBS's CSI: NY. Certain episodes spiking when CSI: NY episodes were repeats (or replaced with other programming) when Law & Order episodes were new.
Title: Law &amp; Order (season 18)
Content:  The 18th season of Law & Order premiered on NBC on January 2, 2008, and concluded on May 21, 2008.
Title: Law &amp; Order: Special Victims Unit (season 18)
Content:  eleventh episode of the season, "Great Expectations," which aired on NBC on February 15, 2017 (after being moved from its initial air date of November 9, 2016, and a second air date of January 4, 2017). At the end of production of the season, during upfronts SVU was renewed for a nineteenth season. Following the renewal announcement, it was revealed that show runner/executive producer Rick Eid had departed the show. He took over Chicago P.D. as showrunner/EP starting with its fifth season, replacing C.P.D. co-creator/EP Matt Olmstead. Michael Chernuchin, former showrunner and executive producer for Dick Wolf's Chicago Justice series, as well as a former executive producer and writer for many past incarnations of the Law & Order franchise, was selected as SVUs new showrunner.

Question: when does season 18 of law and order svu start?
Answer: September 21, 2016.