Every PC has its own time clock that maintains its date and time. Overall the clock is pretty accurate. However, it can stray from what it should be over time.
One way to make sure your PC (and/or network) has the correct time, is to visit www.time.gov. This shows the exact date and time (accurate to within a few 1/10ths of a second) with respect to the atomic clock time at the National Institute of Standards and Technology (NIST). NIST is a government agency that is charged to maintain the time, weights and measure standard for our country. Once you see the correct time, you could then update your PC.
Another way to keep “up to date” is to download a program that links to the NIST atomic clock and have the program set the time on your PC. One such program is available as a free download at http://download.cnet.com/AnalogX-Atomic-TimeSync/3000-2350_4-10774262.html?tag=mncol;2.
