How a computer tells time
"Computers running Windows 95 or later can take advantage of a third circuit to measure time even more accurately. The frequency of this high- speed oscillator varies from one computer to another. But it usually produces a few million pulses each second.The late Karen Kenworthy
Because this timer ticks so furiously, Windows allocates more space to store its current value. This counter can continue to increase until it's recorded a total of 18,446,744,073,709,551,615 ticks! This should take at least 21,350,398 seconds (assuming a fast 10 MHz oscillator), or a little over 58,454 years, before the counter reaches its limit. They tell me at that point the count is reset to zero and begins again."
If you're a real geek, you may want this:
Excel Function Wall Clock
Some of the functions used to indicate the time are:
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