http://hl7.org/fhir/StructureDefinition/workflow-releaseDate|5.2.0

Indicates the date on which request or event resource that has a status of 'on-hold' or 'suspended' should be moved back to an active state.
typedestination
baseDefinitionhttp://hl7.org/fhir/StructureDefinition/Extension
typehttp://hl7.org/fhir/StructureDefinition/Extension
Extension.value[x].typehttp://hl7.org/fhir/StructureDefinition/dateTime