Respected rajesh sir the great!
A number of gadgets including mobile phones, cameras and computers,
have a small sized batttery that keeps track of the time.
In computers, complementary metal oxide semiconductor (CMOS) is the
one that keeps track of time, even if the power is off.
If in more deep, it does keep track of time because of a special chip
fixed in it call RTC (real time clock). It’s essentially a quartz
watch that runs all the time, whether or not the computer has power.
Every personal computer contains two clocks: a built-in hardware clock
and a virtual clock. The hardware clock (real-time clock) runs whether
the system is on or off. The virtual clock (system clock) is set to
the real-time clock when the computer is turned on and exists only
while the computer is operating. While the computer is up and running,
the two clocks run independent of each other.
The system clock is a 24-hour timer and has no real concept of days,
whereas the real-time clock tracks the time and date. In fact, the
system clock has no concept of traditional hours, minutes, and
seconds. It merely increments a counter 18.2 times per second. The
operating system, which is dependent upon the system clock for the
time, converts the counter into hours, minutes and seconds.
As for the date, the operating system reads the real-time clock via
the BIOS during initialization, then tracks the date independently
based on the virtual-system clock rolling over midnight.
In your case, seems that the CMOS battery is not working properly
or got dead. In this case, what happens is that computer boots
correctly, even all the other things work as usual, but the date and
time would be incorrect.
Replacing the CMOS battery should be the solution of your problem i guess.
Hope it helps.
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---------- Original message ----------
From: "Asudani, Rajesh" <rajeshasud...@rbi.org.in>
To: "accessindia@accessindia.org.in" <accessindia@accessindia.org.in>
Date: Mon, 5 Oct 2009 10:05:12 +0530
Subject: [AI] Computer clock haywire
Friends
The clock of my computer has gone haywire.
I mean it lags behind a few hours every time I start my computer.
While running the PC, I think it keeps the correct time but goes to
slumber once I switch it off.
It brings me to seek from you the probable causes of the same and
possible remedy as well.
I am also curious to know what keeps the clock going while PC is
switched off, or a cell phone is switched off.
Regards
Rajesh Asudani
Assistant General Manager (PPS),
Reserve Bank of India
Nagpur
09420397185
O: 0712 2806676
Res: 0712 2591349
Doth God exact day-labour, light denied?"
John Milton
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