How computer calculate time in shutdown?

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Hello,i want to know when we shutdown our pc after some time we get current time how it is possible?
if answer is ups then what happens when power of the ups will empty?

if anyone know then answer immediatellky..............

1 reply

Dear Sir,

The reason why you get the current time even when you have turned

off the computer is for there is a small battery that is responsible for

keeping the system's essential information. It is known as the CMOS


Thanks in advance.