"Want You Back" is a song recorded by Australian rock band 5 Seconds of Summer. It was written by Calum Hood, Asia Whiteacre, Jacob Kasher Hindlin, Ashton Irwin, Luke Hemmings, Steve Mac and Andrew Goldstein, with production handled by Goldstein and Andrew Wells. The song was released via Capitol Records on 22 February 2018, as the lead single from their upcoming third studio album, Youngblood (2018).

When does want you back by 5sos come out? Let's have some stream of consciousness first.
The relevant sentence in the passage is: The song was released via Capitol Records on 22 February 2018, as the lead single from their upcoming third studio album, Youngblood (2018). So, the answer is 22 February 2018.