Very strange problem occured today. Strange because BST started a month ago.
User reported “all day” events in calender were spanning todays.
On investigation found time zone to be casablance rather than Greenwich Mean Time : Dublin, Edinburgh, Lisbon, London with BST enabled when logged in via an ICA session. Was correct under an RDP session.
I created a batch file containing
“control.exe timedate.cpl,,/Z (GMT) Greenwich Mean Time : Dublin, Edinburgh, Lisbon, London”
This resolved the problem for the user and I initially added it to the domain login script. On further investigation I found that “Allow time zone redirection” had been enabled within GP.
After removing the workaround batch file and disabling the above GP option, I forced a GP update and the problem was resolved.
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1 comment
Paul Brown says:
May 18, 2010 at 9:28 am (UTC 0 )
This problem appears to center around the difference in GMT and UTC.
Windows 7 time is now specified as UTC. All previous version of Windows including Server 2008 still operate in GMT. (I expect the next version of windows server to operate in UTC time)
If timezone redirection is enabled in Group Policy and the ICA client is running on a linux device then the timezone information is not passed through the ICA session.
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“The default setting of “do not pass through timezone redirection” should be kept i.e. “disabled”. This overides any further settings made on the citrix farm.
By default, the session time zone is the same as the server time zone, and the client computer cannot redirect its time zone information.
If the status is set to Enabled, clients that are capable of time zone redirection send their time zone information to the server. The server base time is then used to calculate the current session time (current session time = server base time + client time zone). Currently, Remote Desktop Connection and Windows CE 5.1 are the only clients capable of time zone redirection.”
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