Por padrão, o Windows assume que o relógio do hardware está configurado para a sua hora local, enquanto o Ubuntu assume que o relógio do seu hardware está configurado para o Tempo Universal Coordenado (UTC).
Você pode configurar o Windows para usar o UTC ou configurar o Ubuntu para usar seu horário local, pois a documentação do Ubuntu explica:
Make Windows use UTC
Note: This method was not initially supported on Windows Vista and Server 2008, but came back with Vista SP2, Windows 7 and Server 2008 R2.
To make MS Windows calculate the time from the hardware clock as UTC. Create a file named
WindowsTimeFixUTC.reg
with the following contents and then double click on it to merge the contents with the registry:Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation] "RealTimeIsUniversal"=dword:00000001Make Linux use 'Local' time
To tell your Ubuntu system that the hardware clock is set to 'local' time:
- edit
/etc/default/rcS
- add or change the following section
# Set UTC=yes if your hardware clock is set to UTC (GMT) UTC=no