From the State of the Network:

Upcoming Server Downtimes:

Thursday, June 19th from approximately 6:00 AM PDT to 11:00 AM PDT
All game worlds will be taken offline to prop the monthly update for June.

Thanks to Magik Brute of Leafcull for bringing this to our attention. As always, when the patch goes live please use our Patch Tree to submit and read updates!