Group notices are timestamped in GMT now. For example I got a group notice about a Relay For Life event that was happening until Noon. Didn't specify what time zone because standard SL time is Pacific Time, everybody knows that. But the message was sent at 17:28:21 GMT on Saturday, May 9th. In other words this guy is going to be in a dunk tank and available for 16 hours, 31 minutes and 39 seconds? Not going to happen that way.
I know people have complained that standard time is Pacific Time instead of GMT, but if you really want to make that change, change SL time to GMT first, we need only one standard time to work with, not two. Dealing with all timestamps being shown in SL time and then GMT for group notices just makes life even more confusing than it was already.
Might also be better if we have the option to choose what time zone all times are displayed in, regarding timestamps and the time in the upper right corner, as well.
The notice-stamp is still shown in GMT, and the group-window still shows the local date.
See screenshot "timestamps". This notice was sent the 20th of may, 16:24 PDT, local time-zone The Netherlands (GMT+2 at the moment).