Fist make sure that the hardware clock is enabled and the fake hardware clock is disabled (you can also remove it completely), by running the following commands:
sudo update-rc.d hwclock.sh enable
sudo update-rc.d fake-hwclock remove
sudo apt-get remove fake-hwclock
sudo rm /etc/cron.hourly/fake-hwclock
sudo rm /etc/init.d/fake-hwclock
…
