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Under system preferences, date & time, just check the box that says, "Set Date and Time Automatically." Is that what you're asking for?
 
U.S. Navy Observatory Master Clock Time


Woof, Woof - Dawg
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Camille said:
Where can i fund the exact time to put in my computer?

Since you have a network connection (an assumption based on a web page being suitable for you). Why not just set the OS X time preferences to automatically sync with a network time server?
 
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