Because I was rather bored....
Aug. 2012 - Dec. 2013: Toonami starts at midnight
Jan. 2014 - Jan. 2015: Toonami starts at 11:30
Feb. 2015 - May 2016: Toonami starts at midnight again
May 2016 - Sept. 2016: Toonami starts at 11:30 again
Oct. 2016 - Dec.2016: Toonami starts at midnight....a third time
Jan. 2017 - March 2017: Toonami starts at 11:30....a third time
March 2017 - July 2017: Toonami starts at 11
July 8th, 2017 - July 22nd, 2017: after a few weeks, Toonami returns to 11:30...a FOURTH time
July 29th, 2017 - ???: Back at 11 again
So since it started back up almost 5 years ago, we've gone through 8 changes as to when the block starts, & I didn't count losing the rerun slots.