Computer Clock

[fifi]

I have two W2K machines that are not networked. I use them for some stuffs. BUt I try to keep their time very close to the nearest second. But everytime I look at the computer time clock one of them is ahead by at least 10 seconds. I will set them close again and in about 3 to days it will be ahead again by about 9 secs. One m/c is 5 years old and the other is about 3 yrs old. Is this a CMOS battery problem? Will setting the clock at the DOS prompt or the BIOS correct this? What other way available to sync these m/cs w/o networking or connecting to remote time clocks?

[andyms18a]

you can replace the CMOS battery's on both computers and set the bios time the same on both but with out connecting both computer to a internet time server you will get a time difference after a wile as the bios clocks are not very accurate and windows sets its time from them