Fix a Computer Clock That Forgets the Hour Hassle-Free PC By Rick Broida, Aug 11, 2010 12:42 pm PDT ...

If your computer can't keep good time, it may be due to Microsoft's crummy time server. Here's a replacement that should do the trick.

However, there can be instances when the default time zone in your PC may change due to other factors, which can then lead to “Your Clock Is Ahead/Behind” error.

As the subject says, I have a MacBook (work computer, but I'm the admin). The clock is consistently about 6 minutes slow. It is set to automatically update, and when I open the Date & Time ...