Just what it says.
Set time automatically, Adjust for daylight saving time automatically. If you turn these off, you will have to set your computer’s clock, time zone, and daylight saving settings manually.
Time and date formats. What’s the first day of the week? Do you put the month first, American style (7/30/14), or the date first, European style (30/7/14)? How do you like the time written out?
Specify where you live and what language(s) you speak, for the purposes of tailoring the Web sites you see and the onscreen keyboards available to you.