XenDesktop sessions were not updating their time even after all the correct policies were configured in Citrix Policies and Microsoft Group Policy. This only occurred from workstations in one building and not all our computers across the enterprise. We knew the issue was most likely caused by something on client device.
Installing this Cumulative time zone update corrected the issue when users logged into XenDesktop 7.6. On a side note-We did not see time zone issues when they logged into a XenApp 6.5 Published desktop.
Client Side fix was to install a Microsoft update for time zone information.
December 2014 cumulative time zone update for Windows operating systems
https://support.microsoft.com/en-us/kb/3013410
