you’re able to show seconds in system clock on Windows 10 if you want.
Therefore, its advised youbackup registry in Windows 10and you could restore the registry if something goes wrong.
Find the following registry key.

Edit registry to show seconds in Windows 10.
Right-click theAdvancedfolder, and selectNew -> DWORD (32-bit)value.
punch in a name for the new registry key:ShowSecondsInSystemClock, and press Enter.
Double-click theShowSecondsInSystemClockkey and set its Value data as1.
Click OK to save the changes.
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