System time changes after sleeping and waking up? Closing the lid to sleep, after waking, the system time would change by as much as 2 seconds.

Verified by using terminal command for over a month, daily
sudo -S ntpdate -u time.apple.com
Seems fairly normal, probably just checking back in with Apple servers about the time (time.apple.com) If you'd like to disable it, you can uncheck "Set date and time automatically" under Date and Time in System Preferences.