Dear Rajesh Asudani,
The time and date in computer/mobile phone,are maintained by a dedicated clock 
circuit. This circuit is permanantly charged by the button cell on the mother 
board/battery in cell phone. Even when the systems are switched off,this tiny 
circuit will be working. When the system is again booted up,the clock and data 
information from the tiny RTC circuit is read by the CPU and updated. Only in 
case of battery power low or RTC sircuit failure,the clock and date displays 
become erroneous. Sir,I hope the problem is clear to you.
Cheers,
Prasannakumar.
SMILE WITH ME-Cheers


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