After a brief delay in the launch to address critical bug issues, Square Enix has announced, via their official Final Fantasy XIV Twitter page, the new starting dates for Open Beta Testing. Servers will be running 24 hours a day to allow for round the clock testing by individuals.
The times for the start of each region are as follows:
19:00 (PDT) Wednesday, September 1st
2:00 (GMT) Thursday, September 2nd
11:00 (JST) Thursday, September 2nd