Getting page name as date field

If I understand you correctly you want your page name to be equal the value of date time field i.e.

You probably need to use global events here For example on document save event - update your document name:

[CustomRequestEventsHandler]
public partial class CMSModuleLoader
{
    /// <summary>
    /// Attribute class that ensures the loading of custom handlers
    /// </summary>
    private class CustomRequestEventsHandlerAttribute : CMSLoaderAttribute
    {
        /// <summary>
        /// Called automatically when the application starts
        /// </summary>
        public override void Init()
        {
            DocumentEvents.Update.After += (sender, args) =>
            {
                TreeNode node = args.Node;
                if (node != null) // DocumentUpdateBeforeEventHandler(node);}
                {
                    if (node.ClassName == "MyClassName")
                    {
                        node.DocumentName = node.GetValue("MyDate").ToString();
                    }

                    // other code
                    node.Update();
                }


            }
        }
    }
  }

Make the field requires, then make the field type a text field, then put a default value of ##TODAY## for the field. Should auto populate the field with today's date/time.