To set up your date and time, first you have to go to System Preference and under System grouping, look for Date & Time. You also can use your QuickSilver for quicker access by using keyword
Mouse can do for your this favor too, you can take your mouse to click on Date & Time icon.
Now you've already been inside Date & Time Preference Pane.
You can set up your Date & Time automatically by following Apple time or by selecting your Time Zone.
What you have to do here is just ticking the check box. Your Mac will automatically retrieve your data via one of its three websites, i.e. time.apple.com, time.asia.apple.com and time.euro.apple.com. To be honest, I do not know what is their different until now.
Go under Time Zone tab. You will see world map there. Set your "Time & Date" by whether clicking on the map or using pull down menu of closest city. In my opinion, clicking directly to world map will be easier and faster.
Now you can say to other people, "Wow, setting Date & Time is a piece of cake, I can do it within a minute."
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