The installer may ask you if the computer's clock is set to UTC. Normally this question is avoided if possible and the installer tries to work out whether the clock is set to UTC based on things like what other operating systems are installed. In expert mode you will always be able to choose whether or not the clock is set to UTC. Macintosh hardware clocks are normally set to local time. If you want to dual-boot, select local time instead of UTC. Systems that (also) run Dos or Windows are normally set to local time. If you want to dual-boot, select local time instead of UTC. At this point &d-i; will also attempt to save the current time to the system's hardware clock. This will be done either in UTC or local time, depending on the selection that was just made.