Tomorrow, December 4th at:
12.30 UTC
14.30 CEST (UTC +2)
08.30 EST (UTC -4)
21:30 KST (UTC +9)
We will have a period of scheduled updates for backend services. Please pardon the Killing Floor 3 downtime that is expected to last up to 2 hours.
[PSA] Killing Floor 3 Scheduled Backend Maintenance Tomorrow - December 4th
Source: Steam Community (opens in a new tab)