When talking in "days" the day before any event,in this case the ex dividend date for FTR, is the day BEFORE. The day OF means the day of the event. The day before or, if one will, the day "LEADING IN TO" the ex dividend day for FTR was 9/12/16. On 9/12/16 the FTR sp rose significantly as opposed to the erroneous predictions of the sp sinking on 9/12/16 as we all read. The day of or ON the ex dividend date the FTR sp fell significantly. We all knew this was going to happen as it always does.nothing new there.
The day to buy FTR stock would have been ON THE EX DIVIDEND DATE and NOT the day "LEADING IN TO" THE EX DIVIDEND DATE.
My opinions are just that......my opinions. Good luck to all investors/traders.