Most operating systems try to sync with time servers automatically, but they don't do it often enough. Windows, for instance, may only check its accuracy once a week.
Never Be a Second Late: The Ultimate Guide to Atomic Time Clock Downloads atomic time clock download
In an era where "real-time" is the only time that matters, the clock on your taskbar might be lying to you. While your computer’s internal clock is fine for casual browsing, it is prone to "drift"—the gradual loss of accuracy caused by temperature changes or hardware limitations. Most operating systems try to sync with time
Account for the "travel time" it takes for the signal to reach your computer from the server. atomic time clock download