Timing in Computers

We set the correct date and timings in computer for the first time.Then after it works fine.But when computer is switched off and restarted again, it displays the wrong timing.

Let us see the reasons for why there is wrong display of time in next boot..

In computers, there is an internal clock. This internal clock needs electricity.This clock is referred as Real Time Clock.

For this clock, a small battery gives power even if the computer is shutted down.

In computer motherboard, this battery resembles a one rupee coin which gives power supply to the Real Time Clock.

If this battery does not work in computer motherboard, then there can be wrong display in date and time.

When computer is turned off, then due to battery malfunction, the Real Time Clock stops functioning.

Thus if this small battery(resemblance of one rupee coin) is changed, then correct date and time can be obtained in every boot..