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The clock in Windows 10 displays the time with a delay; it only updates after a refresh.
The system clock in the lower-right corner of the taskbar sometimes stops updating and displays a time that is a few minutes or even longer behind the actual time. When you click the clock to open th...
The battery on your motherboard that powers the system clock when the PC is off might be failing. If it's drained, the time will be incorrect on startup. Replacing this battery is a common fix.