Maintenance for the week of May 20:
• PlayStation®4: NA megaserver for maintenance – May 24, 1:00PM EDT (17:00 UTC) – 3:00PM EDT (19:00 UTC)

https://forums.elderscrollsonline.com/en/discussion/475853/

Maintenance for the week of May 27:
• PC/Mac: No maintenance – May 27
• PC/Mac: NA and EU megaservers for patch maintenance – May 28, 4:00AM EDT (8:00 UTC) – 8:00AM EDT (12:00 UTC)