Incorrect Date and Time in Max OS Lion upon reboot
Yes, Windows and Mac OS calculate time in a different way, and so clash when dual-booting. The bootcamp drivers should include a little file called Appletime.exe which is supposed to fix any time sync issues between Windows and Mac OS. 

If this file is not present or not running, you can manually install it from here: http://www.softpedia.com/get/Desktop-Enhancements/Clocks-Time-Management/AppleTimeFix.shtml