1) add in-game command \time, which shows the time, for example:
command: \time
result: 3:30 PM Eastern (-5 GMT)
2) when we see Server Downtime alert show how much time left too, for example:
The DDO Game Servers will be brought down on Friday, January 27 from 2:30 - 3:30 PM Eastern (-5 GMT) for maintenance. You have 24 min left. Thanks for your patience, and we'll see you back in the game soon!