The Clearinghouse for International Computing
System Utilities for Mac OS X:
ClockChecker addresses a bug that appears in some versions of Mac OS X. When the user starts his or her computer, the clock often reads December 31, 1969 17:01 instead of the correct date and time. ClockChecker checks the time when the user starts up. If the current time is earlier than the time of the user's last login, the user is prompted to verify the clock.