Module Link: http://drupal.org/project/scheduler

The Scheduler modules allows you to schedule the publishing and un-publishing of nodes based off of date and time.

• Who: Technical and non-technical users
• When: Use this module when you need to publish (or unpublish) a node that is not right now.
• Where: You must enable the ability to schedule publishing in permissions, on the content type and set the date/time in the individual node.
• Why: This module is a simple way to have your nodes magically appear and disappear without the public knowing that you aren't even there.

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