It takes place in the 2014-2015 school year. The chalkboard in Mrs.Hialeah's class has October 5th clearly written in the 4th episode "Fued of Friends and Foes". Also the alumni valedictorian, Paris Drake, mentions graduates of the class of 2015 in her speech in the final episode.
The 1st alumni valedictorian, Mac Rowley, mentions today as it's June 1st 2015 in his is speech during the last scene of the series.
