Submission + - Why Computers Still Struggle To Tell the Time (itworld.com) 1
itwbennett writes: It’s pretty much impossible for a computer to keep exact time, although accuracy can be improved to the extent that users are willing to spend more money on the problem, said George Neville-Neil, a software engineer who helps financial institutions and other time-sensitive organizations maintain ultra-precise measurements of time. To keep internal time, computers use a crystal oscillator that creates an electromagnetic signal, or a vibration that the computer uses to coordinate processor, memory, bus and motherboard operations. But computer makers often use inexpensive crystals costing only a few cents each, which can compromise accuracy. 'If you buy server-class hardware, you will get cheap crystal, and time will wander if you don’t do something about it,' Neville-Neil said.
