Why is the time different between Mac OS X and Windows XP on my computer?
The Windows XP and Mac OS X operating systems handle your computer’s date and time information differently, so the date and time may be different when you switch operating systems. For best results, use a network time server and resync the date and time whenever you switch operating systems. In Mac OS X, use the “Set date & time automatically” option in the Date & Time preferences. In Windows XP, click the Update Now button in the “Date and Time Properties” control panel.
