Feels like twisty is taking the piss now and just tweeting whatever to see what people will make of it.
(
a)
If we were to take it seriously (and read the date the correct way), she posted the bomb tweet at that date and Twisty's birthday was one day later.
There's also the possibility that she wrote the date the wrong way and the day is in September. Could be her graduation date, but that wouldn't fit the timelines.