The second chapter of Mental Out begins roughly October 12, and we are on the same day until chapter 17. The bakatsuki calender puts Jailbreaker on the 14th, but I think the correct date should be 17-18th, concurrent with the DRAGON Arc in Index.
If I was asked what date this current chapter...
Dopplegänger happens the evening of October 10 and Jailbreaker begins October 16. Given that Aqua of the Back, British Royal Family, and DRAGON all happen mid-October too... Misaka going to war two weeks after Jailbreaker happens 😭