I just thought I'd give people an easy to find guide for this information. Hope the mods are alright with that, and that this doesn't violate any posting guidelines.
1. Why does this happen?
The simple explanation is; Windows uses Greenwhich time, and OSX uses Universal Time. It's as simple as that. Every time the other OS boots up - it changes around your BIOS settings in-order to 'correct' the CPU clock timer - which is essential for any computer to calculate...
Fix incorrect time in Windows + OSX dual boot
1. Why does this happen?
The simple explanation is; Windows uses Greenwhich time, and OSX uses Universal Time. It's as simple as that. Every time the other OS boots up - it changes around your BIOS settings in-order to 'correct' the CPU clock timer - which is essential for any computer to calculate...
Fix incorrect time in Windows + OSX dual boot