This article only applies to Squared Up Version 2.0. If you're looking for help with Squared Up Version 3.0, please visit our new knowledge base

Operations Manager does not support maintenance mode scheduling. You can only enable maintenance mode to take effect immediately.

The Specific date and time setting in Squared Up is the same as the Duration Specific end time in SCOM, as shown below.  Using this option starts Maintenance Mode immediately and ENDS it at the specified time:

There are several community solutions for scheduling maintenance mode (try a web search for 'operations manager maintenance mode tool' or similar).

In particular we suggest you check out the web-based SCOM 2012 Maintenance Mode Scheduler by Tim McFadden.

You might also be interested to hear that Microsoft are planning to introduce scheduling to SCOM reasonably soon, and at Squared Up we'll be keeping a close eye on this:

See also:

An Introduction to Maintenance Mode

How to put a group or distributed application into maintenance mode

How to create a desktop shortcut to a server page in Squared Up