"Most PC users probably don't pay a lot of attention to the date/time entry
in the notification area. The time is supposed to be synchronized over the
Internet once a week to keep it accurate. However, the default time server
time.windows.com doesn't always work very well and your time may not be as
accurate as you think." Here's what you can do to fix it.
http://www.techsupportalert.com/content/how-make-sure-your-pc-has-right-time.htm
