With TFS2013's new Release Management, is it possible to deploy at a given date/time, as in scheduled releases.
For minimized impact on users in Production, we'd like to be able to deploy during down time (during the night for example).
Yes.
When approving the acceptance step (first step of a stage), in the popup, you will have the option to approve now, or give a date and time. If you select a date/time, the deployment will be triggered only then.
No need to wake up in the middle of the night!