Hi techrep,
The time zone in WSUS is not configurable, WSUS stores all time internally. Please check the explanation by Lawrence Garvin in the following post:
https://social.technet.microsoft.com/forums/windowsserver/en-US/0acd48ac-8a8a-46b0-b29c-89dca37f1d72/wsus-time-zone
So, as far as I'm concerned, please check if the clients indeed report to WSUS server in time, you may check the windows update log of the clients to check the report time.
On the clients do not report to the WSUS server, I would recommend reset windows update components:
https://support.microsoft.com/en-us/kb/971058
Then run wuauclt/ detectnow in cmd, check if clients will report.
On the WSUS server, please run Server Cleanup Wizard.
Best Regards,
Anne
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