Ex-dividend means that you will not get this quarterly dividend if you by on or after the ex date. If you buy any day before 2/13 - you get the dividend, even if you sell on 2/13 or after. So in this case you can "capture" the dividend by buying at the close on Friday and selling at the open on Monday. Note that "capture dividend" strategy makes no sense IMO, unless you have VERY special tax circumstances.
"capture" of the dividend usually doesn't work when done that close to the ex-dividend date because the stock price will adjust to offset the difference. i.e., if the dividend is 20 cents, the pre ex-dividend price will be 20 cents higher than after, all other things being equal.