This screen shot shows what you would see when you choose to edit a page in QuantumCMS 4.1. The buttons and tabs have been cleaned up, some icons updated, and some space reclaimed.
In addition to the Release Date (which exists only for display purposes), there is a Publish Date and Unpublish Date. If you enter a date into the Publish Date field, that's when the page gets published to the site. Conversely, adding a date to theUnpublish Date field will cause the page to unpublish itself when that date comes to pass.