Will add the following to the 'comments' for the 'recorded' element: Recorded date indicates date the data was placed in the record maintained by the performing practitioner, or of disclosure by patient or RelatedPerson, not a date of record transfer.  If the record is transferred from one system to another (in paper or electronic form), it does not create a distinct recordedDate.  In most cases, performing practitioners will record on the same date the event occurred, but sometimes there are delays.  If information is being relayed second-hand, recordedDate indicates when the system is first made aware of the data. RecordedDate is NOT intended to be the same as a database.createdTimestamp - that would be captured as part of resource.meta or possibly Provenance. It is possible for the same event to be disclosed to different systems at different times.  E.g. a patient might tell two different clinicians about a historical event at different visits.  If the disclosure is from the patient rather than record transfer from clinician A to B, the recordedDate would be the date each respective clinician put the data in their record.  If the data flowed from clinician A to B, the recorded date would remain the recordedDate as initially set in clinician A's system.