"Thanks all of you for your valuble suggestion. I will use PCF RTC. Bye thnks. "

Good. Anyway don't stop there - try to add code for a multi event programmable timer that can switch loads on/off at preset times in a day / week / month. THAT really is fun. Long back I started out with a RTC and LCD display - once the project was over there was not much fun left. So I added the above multi event timer and boy it WAS great fun.

Raghu