The Elder Scrolls Online? The earliest access starts in just five days. But if you've got the five-day headstart, when can you actually log in? When can you first enter the game on launch day? The answer, as outlined in the new launch FAQ on the site, is 7:00 a.m. EDT on March 30th for 5-day early access, 7:00 a.m. EDT on April 1st for 3-day early access, and 7:00 p.m. EDT on April 4th for the full launch.
There's more useful information in the launch FAQ, as well. Beta participants will not need to re-download the client, and the full retail patch can be downloaded as early as March 27th. You will be able to upgrade to the game's Imperial Edition following the launch, but the Explorer's Pack requires a pre-order. For any other questions you might have, take a gander at the full FAQ to make sure you're ready to go when the servers open up.