Java LDAP Unix Timestamp | Why Nanotime to Java date convert use Formula: (((1970-1601) * 365) - 3 + Math.round((1970-1601)/4) ) * 86400L?

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Can someone please explain the ldatDatetime to date code especially :

(((1970-1601) * 365) - 3 + Math.round((1970-1601)/4) ) * 86400L;

The code a