May be my title is wrong. But I want to know what thing in computer update the time. In our normal watch and mobile this facility is not there. Please tell me.
near the place where the space for additional RAM is provided,there is a CMOS battery which is a small circular disc shaped thing which directly controls the time displayed on the monitor.
If you ever happen to view wrong timings on your screen which do not get set even after your tinkering with the date\time settings, go for a CMOS battery change.Just costs about Rs.30 in Delhi.