Greetings Ascended!
The RIFT shards will be coming offline for a restart at the following times:
NA: 7:30 AM PST
EU: 3:30 PM UTC
The estimated downtime duration is 1 hour -- but we do hope to come in under that.
Thanks for your patience!
NA/EU Restart: NA @ 7:30 AM PST 11/15/18 / EU @ 3:30 PM UTC 11/15/18
Source: Steam Community (opens in a new tab)