TimeZoneInfo believes that GMT Daylight Time exists, but there is no such thing. - by R Pond

Status : 

  By Design<br /><br />
		The product team believes this item works according to its intended design.<br /><br />
		A more detailed explanation for the resolution of this particular item may have been provided in the comments section.

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ID 298123 Comments
Status Closed Workarounds
Type Bug Repros 1
Opened 9/14/2007 8:43:26 AM
Access Restriction Public


TimeZoneInfo returns the following DaylightName for the UK time zone - "GMT Daylight Time".  But there is no such thing.  GMT is the same thing as UTC (give or take a fraction of a second!) - i.e. it's an absolute time reference.  The UK uses GMT during the winter only.  During the summer we use BST (British Summer Time), which is identical to what GMT Daylight Time would be if there were any such thing, which there isn't, any more than UTC Daylight Time exists.
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Posted by Microsoft on 9/17/2007 at 2:55 PM

Thanks for the feedback. The behavior is by design; TimeZoneInfo uses time zone data from the registry.

In this case, it is using data from the following key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones\GMT Standard Time. The value of the Dlt is "GMT Daylight Time".


Justin Van Patten
CLR Program Manager
Posted by Microsoft on 9/16/2007 at 11:32 PM
Thanks for your feedback. We have reproduced this bug on Visual Studio 2008 Beta 2, and we are sending this bug to the appropriate group within the VisualStudio Product Team for triage and resolution.

Thank you,
Visual Studio Product Team.
Posted by Microsoft on 9/16/2007 at 6:09 PM
Thank you for your feedback. We are currently investigating. If this issue is urgent, please call support directly (see http://support.microsoft.com).

Thank you,
Visual Studio Product Team