Clock synchronization utilities are meant to calculate the differences between the PC clock and the one displayed by a reliable time server.
Consequently, the applications will correct the computer's system clock so that it matches the world time.
Some of these tools can also periodically control the time offset between the computer and a selected server, then show a notification containing the results of the verification.
There are some apps that also manage the daylight savings so that the user does not have to modify anything.
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