1oloo, you've asked three different questions about timing circuits. How about telling us exactly what the application is and what you're trying to achieve and we should be able to suggest a solution for you.
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If you only need to switch equipment on and off on a 24H cycle, by far the easiest solution is to buy a mains powered timer which plugs into a wall socket. This will cost a couple of Pounds / Dollars. Don't forget that you can plug a wall-wart into the switched socket if you need to control smaller equipment.
You're not interested in buying one then? L
What do you want the timer to do ? The obvious answer is use an Arduino.