Maintenance for the week of March 24:
• PC/Mac: NA and EU megaservers for patch maintenance – March 24, 4:00AM EDT (8:00 UTC) - 10:00AM EDT (14:00 UTC)
• Xbox: NA and EU megaservers for patch maintenance – March 26, 6:00AM EDT (10:00 UTC) - 12:00PM EDT (16:00 UTC)
• Playstation®: NA and EU megaservers for patch maintenance – March 26, 6:00AM EDT (10:00 UTC) - 12:00PM EDT (16:00 UTC)
It's always been approx. the week before the Anniversary Jubilee event starts. So, that'd be near the end of this month. They'll announce it in a few days.