Get a watch or, better still, a strontium atomic clock:

http://www.nist.gov/public_affairs/clock/clock.html

"The JILA strontium clock would neither gain nor lose a second in more than 200 million years, compared to NIST F-1's current accuracy of over 80 million years." - Feb 14, 2008

http://www.youtube.com/watch?v=4d9IU-Dyemo

"Time is what prevents everything from happening at once" - John Wheeler