Why has Linux changed my pc clock when I revert to windows?

I finally got hold of a version of Linux that I was able to install (ubuntu 8.04)I built my PC so the HDD live in removable racks not internally so Linux has its own HDD and is not sharing a disc with windows (XP home installed as SP2 upgraded online to SP3) Prior to installing Linux, windows believed the time was... show more I finally got hold of a version of Linux that I was able to install (ubuntu 8.04)I built my PC so the HDD live in removable racks not internally so Linux has its own HDD and is not sharing a disc with windows (XP home installed as SP2 upgraded online to SP3) Prior to installing Linux, windows believed the time was BST (GMT+1) Whilst running Linux believes the same, how ever on restarting with the windows drive that now believes the time to be GMT. My assumption (sorry I should have checked before asking) is that during the installation of windows the system clock has been reset, any suggestions as to why or how this happened?
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