ClockCard
Real Time Clock on a PC Card
Beagle Software's ClockCard is an accurate, temperature stable real time clock complete on a PC card.
Use ClockCard to dramatically improve the accuracy of your computer's clock. The ClockCard is real time clock for PCs based on a highly stable oscillator circuit complete with lithium battery  power.
The ClockCard will maintain time on your PC to 15 seconds/month error. If your computer is operating in a temperature stable environment, error will be less than 5 seconds/month. Standard time synchronization can be done using ClockWatch.

ClockWatch
Keeps your internal computer system clock synchronized with the National Atomic clock.

ClockWatch provides a fast and easy way to synchronize your computer system's clock to standard time over the Internet.

ClockWatch queries one of the timeservers maintained by the National Institute of Standards and Technology, which returns the exact standard time.  Settings can be made on demand, on a regularly scheduled basis or automatically based on the specific experience of the local system. You set the level of accuracy desired and ClockWatch checks the time when appropriate. 

Results from clock settings are graphically displayed in windows and charts showing the overall accuracy of your computer. Results of clock settings can also be logged to a file allowing you to save all activity in a text file on your computer for later review or archival. A command line mode allows users to run ClockWatch from a batch file.

"Highly Recommended" PC Computing

ClockWatch is available for both Windows 95/98 and Windows NT.