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By default, PI Coresight uses the time zone of the client machine to display information.
You can override this behavior and force the same time zone for everyone by modifying web.config file under %pihome64%\Coresight.
Check page 59 in PI Coresight 2015 Admin guide - https://techsupport.osisoft.com/Downloads/File/35efc51d-5007-4f6a-9961-842ab775f4b2.
I found this thread after losing a couple of hours trying to determine why the PI Vision trends did not match the Datalink data... Tested it on our development server while traveling away from home this week and it worked great... We will be adding this configuration change to all our facility PI Vision servers over the next few weeks.