here's the thang. IF there's an ex-date published on the Daily List...
...none of that extraneous stuff matters, by rules n regs.
the crucial date, regardless of any "formulas" or "definitions," is the ex-date. Companies in PRs and brokers in e-mails and over the phone screw this up time and again, over and over.
By rules n' regs, you buy before the ex-date and you're entitled to or stuck with whatever the corporate action is.
Any given split, divvy, whatever that doesn't go by that is wrong.