a DataValue
a TimestampsToReturn flag to determine which timestamp should be kept
if attributeId is not Value, sourceTimestamp will forcefully be set to null
an optional current clock to be used to set the serverTimestamp
Param: dataValue
a DataValue
Param: timestampsToReturn
a TimestampsToReturn flag to determine which timestamp should be kept
Param: attributeId
if attributeId is not Value, sourceTimestamp will forcefully be set to null
Param: now
an optional current clock to be used to set the serverTimestamp
Returns