本来已是常识，但后来trading date 和record 接近了，ex-div date可以晚一天。下面是Google说的：
The ex-dividend date for stocks is usually set one business day before the record date. If you purchase a stock on its ex-dividend date or after, you will not receive the next dividend payment. Instead, the seller gets the dividend.
今天我持有的IBM被called away，有些网站上显示，2月10日是ex-div date，也就是说买走股票的得不到dividend。很难相信这人会出这样的错，哪儿不对？