http://hl7.org/fhir/StructureDefinition/allergyintolerance-assertedDate|5.2.0

The date on which the existence of the AllergyIntolerance was first asserted or acknowledged. This extension is deprecated and replaced by condition-assertedDate extension.
typedestination
baseDefinitionhttp://hl7.org/fhir/StructureDefinition/Extension
typehttp://hl7.org/fhir/StructureDefinition/Extension
Extension.value[x].typehttp://hl7.org/fhir/StructureDefinition/dateTime