what should i do for correcting computer clock, every time it shows different time ?

In addition to those suggestions, your BIOS battery on the motherboard might be dead. The most significant symptom of a dead BIOS battery is that it resets the date and time of the computer every time you shutdown and reboot.

If you change your clock all the time and it keeps losing time that usually indicates that your system battery needs to be replaced. In a desktop it's fairly simple and just requires opening one side of the case, locating the round battery attached to the motherboard. First disconnect the power from the wall. Second ground yourself or touch some metal to get rid of any static you might have built up on yourself. Then most batteries have a clip holding them in and you just need to pinch it a little and then you can get the battery out. Most major stores will carry the battery you need. Most batteries are a CR2032. You can get them at Walmart, Radio Shack, Best Buy, heck I've even picked on up at a Publix grocery store. Best thing is to carry the battery with you to make sure you get the same thing.

Now if it's a laptop it's whole different game and a bit more difficult to get to the battery on the motherboard. Depending on how comfortable you are with taking apart your laptop will determine if you want to take on the task or take it to someone who will. On most laptops you will have to remove the keyboard to get to the battery but in some circumstances the battery can't be seen unless you completely take it apart. If you are talking about a laptop and have never done anything like this before I would suggest taking it to someone who can do it for you, Best Buy for example or your closest computer store.

Another thing that can be wrong it you reset the clock on the taskbar but on a reboot it reverts back to the original time, then you might need to get into your bios and adjust the clock there. Look at your owners manual or online for instructions on how to do this. It's a simple process but can be detrimental to the system if you get in the bios and start messing with things and end up setting something wrong. Then your system may not even boot up or give you errors.

Good luck either way and hope these suggestions help.

While I agree with the others about making sure that windows time is set correctly. It would be helpful to know by how much and if the date is correct or not.

Suggestion: Check the BIOS clock. Does it have the correct date and time? If so, but Windows does not or it does on boot up but does not keep the correct time you can remove and reinstall (refresh) the windows clock to see if helps. If you are gaining or losing time while logged in, the issue may be with your BIOS battery.

If you are on Vista do the following: Click on Clock- > Change Date and Time Settings - > Internet Time - > Check the box that says "Synchronize with an Internet time server"

Verify that text box below the check box had a good website name by just going to the website and checking the time. I have time.windows.com

and hit ok.

So now your computer will always synchronize time with this website when connected to Internet.

Change the time zone and set your computer clock to automatic update.

Also check whether your CMOS battery is OK. Change if not working fine.

Also check the time in BIOS settings which appear when you press Del key after just switching on your computer.

Go to computer setting and click on change a setting.Enter the correct time and enter.It is pretty easy.

In the Date and Time Properties (double click on the time at the bottom right corner) click on the Internet Time Zone and untick the box.

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Just change the CMOS Battery, a small round cell battery on your motherboard.It will solve the problem.

Have you tried correcting the Time zone? This could be a reason.