TimeSpanArray and the TimeSpan Collection EditorThe process for scheduling an application pool to recycle at specific times in Windows Server 2008 and 2012 is a bit different then in previous versions. Launch IIS Manager, expand application pools and highlight the application pool to modify. Under the Actions menu on the right hand side, select Advanced Settings.
Scroll down to the Recycling section and expand it. You are looking for the TimeSpanArray entry of Specific Times section, highlighted in the example above. Click the three dots to the right of this entry.
Click the Add button under the Members window on the left hand side. This will produce a new value in the Properties window. click the new value and modify it using a 24 hour / military clock standard. Select OK and you're all set!