Template to be switched automactically?

Hi all,
Is there any chance to set up templates can be switched automatically following by time on server or customer end. For example, day time to be template 1, night time to be template 2 or by weekdays.

Many thanks

I think the templates are referenced in all the controller files.
It may be easier to set up multiple stores with diffirent templates, then redirect to them using if statments.