Hi,
Use the following expression in the Open behavior rule in FormOptions.
msxsl:string-compare(xdDate:Today(), "2008-09-23") >= 0
For that follow the below steps.
1. Open the form in design mode.
2. Go to Tools -> FormOptions->Open Behaviour->Rules.
3. Place the above expression as condition in the ‘Rules for Opening Form’ window.
4. Set the Action to switch view and select the view whichever you need.
Hope this will help to you.