User blog comment:M.Owen LFC!/The Elder Scrolls Online launch times revealed/@comment-98.213.143.246-20140327195303/@comment-24.253.8.98-20140327222134

From the FAQ link posted above:

Q: What day and time will the servers open for the 5-day Early Access?

A: The ESO North American and European megaservers open at 7:00 AM EDT, Sunday March 30th.