How to put up a notification about scheduled maintenance? I'm using Drupal 7.5 and I want to put up a notification about the website going into maintenance mode on x scheduled date and time. What is the best way to do this? Are there any built-in options for posting server maintenance notifications or must I create a custom block for it?

Forgive me for this super basic question, but I did a search and the other questions on this were more advanced.

Note: this site is run on a Commons Profile and developed by someone else.
Drupal Core has in built option to put site on maintenance but out of the box it does not have option to show maintenance message prior to scheduled date. In order to do that you can Scheduled Maintenance module.


  Scheduled maintenance allows users to schedule an upcoming maintenance
  and show site visitors a warning message in advance.