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Ex-dividend date and time zones
Ex-Date is a function of the exchange, as well as the dividend. Consider Deutsche Bank AG, DB on the NYSE, DKR on Xetra. For a given dividend, each exchange sets the ex-date for trades on that exchange.  (See http://www.sec.gov/answers/dividen.htm for a description of how it works in the US; other exchanges/countries are similar.) This ex-date is normally based on the dividends record date, which is when you must be on the company's books as a shareholder to receive the dividend, and based on when trades for an exchange are settled. The ex-date is the first date for which trades on that date will not settle until after the record date. This means that the ex-date can be different for different exchanges. If you sell your shares on an exchange before the ex-date for that exchange, you will not get the dividend. If you sell your shares on or after the ex-date for the exchange, you do not get the dividend. So it depends on the time zone of the exchange. Most stock exchanges trade T+3, but this can still come into play if there are bank holidays in different countries at different times.