Explanation of the "TIMESTAMP OF LAST EVENT"

Explanation of the "TIMESTAMP OF LAST EVENT"

In the 'Domain Settings' next to each domain controller it reports the TIMESTAMP OF LAST EVENT. Could someone explain what that means exactly?

The reason for asking is that I have ten DCs, eight of them show a TIMESTAMP OF LAST EVENT for today but two of them show TIMESTAMP OF LAST EVENT for several days ago.

Many thanks
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