I have been hearing that several Dual booted computers were have time issues
on windows at several local Linux events. after quick search I found
http://ubuntuguide.org/wiki/Ubuntu:All#Dual-Booting_Windows_and_Ubuntu

and in it is the answer and cure

Adjust Windows clock

When the Linux bootloader is installed, the Windows 8 bootloader / OS no longer correctly identifies the time from the BIOS clock. (The clock appears to perpetually revert to UTC time.) To repair this problem (in Windows 8), see this solution.

In Windows, bring up a command-line terminal and start regedit (or from the Start menu type regedit.exe in the search box). Navigate to

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation

Right click anywhere in the right pane and hit

New > DWORD (32-bit) Value

Name it

RealTimeIsUniversal

then double click on it and give it a value of 1.

Reboot into (K)Ubuntu Linux, then reboot back into Windows. The clock should now display the correct time.