ex divi, page-8

In order to get paid the dividend i must be owning Telstra stock on Feb 18th right?
If I sell it upon market open on Feb 18th do I still get paid the Div?

I've owned TLS for about 1.5 months now but out of curiosity is it allowed to buy TLS on Feb 17th and then get the Div on Feb 18th even if you've only held it for one day?

To get the stock you must own in by the close of business on Feb 17th. You can buy the shares on the 17th, sell on the 18th and you will still get the dividend when it is paid on Fri 22nd March. Remember, all things being equal, the share price of Telstra should fall by approximately the dividend amount on the 18th, just by the fact it went ex-dividend.