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How do I now the exact time and what is the basis of it?

Almost everyone has his own clock. It either shows, Big Ben, or a grandfather clock has inherited. Some set itself to adapt to their usual activities, and if you try to ask at least five people, they have different time!

honestly your two best are the authorities of your computer (If it has Windows XP or, I guess, lately Mac OS) and your mobile phone. Well, a GPS is a little better than anyone, but since you're asking this question, I guess you do not have one. Most comuters these days get their time to some other Internet source time function. Similarly, most phones get the time to a network source. They should always agree, but if they do not, I'd just go with the phone because they generally do not have time to seconds precision (ignorance is bliss in this case). Oh, and it is 6:34.

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