Logins for all SOE games will be affected.

Sony Online entertainment will perform maintenance beginning at 6:00 AM Pacific on May 15, 2012. Maintenance is expected to take approximately 90 minutes. This will impact the following services:

• Logins for all SOE games will be affected.
• Commerce transactions, including purchases on SOE websites and in-game marketplaces will be unavailable.
• Forums will be read-only.
• Account management will be unavailable.

Here's our handy Time Zone Conversion Tool to help you plan!

Source: Station Community Forums