Since this is just gmtOffset, I would assume it would maintain and that daylight savings would not be a factor, but I have not see if it changes or not.
There is a current bug related to the source timezones where the setting is not shown in the UI to update. Source timezones are set based on the cluster timezone, which was inadvertently removed during the change from the old VA UI to the new VA UI.
Here is a workaround to get the current setting, and update the setting:
Run GET /cc/api/cluster/list to get the cluster ID, and view the current gmtOffset.