DocuWare stores all timestamp indexes in UTC time (like GMT). It would appear that when fields are sent out as part of a notification they come out as their literal stored date/time without being translated into any other time zone. This makes sense, as what if the email is sent to someone halfway across the world? Would you want to show the time as it was stored from a specific client location, or just treat everything as UTC so various destinations can shift accordingly?
The reason the indexes in the web client view show as local time is because all timestamps are converted back to the timezone of the one currently viewing the information.
I am curious to see what DocuWare support has to say, though, as I could see you wanting the time to be translated into some other time zone...