property AdjustmentTime: TDateTime;

AdjustmentTime is a read-only TDateTime property that indicates the local clock offset calculated when the DateTime value is retrieved from the remote SNTP server. 

AdjustmentTime is calculated according to the algorithm specified in the errata for RFC 2030: 

LocalClockOffset := ((ReceiveTimestamp - OriginateTimestamp) + (TransmitTimestamp - DestinationTimestamp)) / 2;