This is on the official page here http://eu.finalfantasyxiv.com/lodest...f587bf53f0973d

And it says:
Early Access Period
August 24, 2013 (Saturday), 2:00 a.m. to August 29, 2013 (Thursday), 23:59 (GMT)

Which is why I'm confused because how can you have early access to a game until the 29th if it's launched on the 27th? Is it a typo? Or has it been changed?