From http://eu.finalfantasyxiv.com/lodest...b4bb84c5dcc63c

Upcoming Schedule:

Thursday, June 15, 2017 at 10:00 (BST) / 09:00 (GMT): All Worlds Maintenance (24 Hours)
Friday June 16, 2017 at 05:00 (BST) / 04:00 (GMT): Stormblood patch note reading
Friday, June 16, 2017 at 10:00 (BST) / 09:00 (GMT): Early access begins
Friday, June 16, 2017: PlayStation®3 service ends
Tuesday, June 20, 2017: FINAL FANTASY XIV: Stormblood launches
Tuesday, June 20, 2017: Pre-order in-game items distribution begins
Tuesday, June 20, 2017: Full game registration codes can be redeemed
Friday, June 23, 2017 at 23:59 (Per Region): Early access ends