I have just released the "Wifi Timer" app which I personally developed.
Wifi Timer is a free to use android application to ensure that the Wifi on your device starts and stops automatically, whenever you want it to
If you're not using a Wifi connection all day, why keep it active and searching for a network all day?
Use this app to specify when you want your Wifi connection to start and stop, saving you some battery life and saving you from using your mobile data plan when you could use a Wifi connection instead
Try it out. It is simple, ad free and free to use.
Here is the download link (on Google Play/Android Market):
Do feel free to ask me about any issues, questions or feature requests. I hope you really like the app.