http://hl7.org/fhir/StructureDefinition/openEHR-exposureDate|4.0.1

Record of the date and/or time of the first exposure to the Substance for this Reaction Event.

element_id	types
Extension
Extension.extension
Extension.url
Extension.value[x]	dateTime
Extension
Extension.id	http://hl7.org/fhirpath/System.String
Extension.extension	Extension
Extension.url	http://hl7.org/fhirpath/System.String
Extension.value[x]	dateTime