Yeah, and here's all the dates I found for the franchise
https://en.wikipedia.org/wiki/Assassination_Classroom
"It was serialized in Shueisha's Weekly Shōnen Jump magazine from July 2012 to March 2016, with its chapters collected in twenty-one tankōbon volumes."
"An original video animation (OVA) adaptation by Brain's Base was screened at the Jump Super Anime Tour from October to November 2013. This was followed by an anime television adaptation by Lerche, which aired on Fuji TV from January 2015 to June 2016. A live action film adaptation was released in March 2015, and a sequel, titled Assassination Classroom: Graduation, was released in March 2016."