搞蓝筹必读。http://www.sec.gov/answers/dividen.htm
Ex-Dividend Dates:
When Are You Entitled to Stock and Cash Dividends
Have you ever bought a stock only to find out later that you were not
entitled to the next cash or stock dividend paid by the company? To
determine whether you should get cash and most stock dividends, you need
to look at two important dates. They are the "record date" or "date of
record" and the "ex-dividend date" or "ex-date."
When a company declares a dividend, it sets a record da