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Why does time change in Ubuntu after installing Windows

I have a dual-boot pc (ubuntu/Windows 7). When I boot with Ubuntu my local time (Rome fuse) is correct. But when i boot with wimdows my time is one hour slow. How can i solve this problem?

marked as duplicate by Panther, htorque, Bruno Pereira, Jorge Castro, RolandiXor Jan 11 '12 at 23:59

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You can fix this by either asking windows to set the hardware clock with UTC, or Ubuntu to use localtime.

To make the change in Ubuntu, edit edit /etc/default/rcS and change

UTC=yes to no, like this:

# assume that the BIOS clock is set to UTC time (recommended)



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