The only date you need to keep track of is the ex-div date. That is the date the stock starts trading ex dividend. If you bought and held the stock before this date you get the dividend even if you sell it before the dividend is actually paid. If you buy the stock on the ex-div date or after you don't get the dividend. The record date just confuses things and is an anachronism, in the computer age to think it takes 3 days to record transactions is ludicrous.
If you are wanting the actual money in your hands then I guess the date payable is important to keep track of also ;)