description: This is the first date-time when the value set version becomes active, so this value is present on Inactive value set versions as well. The start Date_time is expected to be as of 0001 UTC of the Effective Date.
package_name: rs/hl7.fhir.r5.core
derivation: constraint
name: effectiveDate
type: Extension
elements:
  extension: {index: 0}
  url:
    pattern: {type: uri, value: 'http://hl7.org/fhir/StructureDefinition/codesystem-effectiveDate'}
    type: uri
    index: 1
  value:
    choices: [valueDate]
    index: 3
  valueDate: {type: date, choiceOf: value, index: 4}
package_version: 4.4.0
extensions: {}
class: extension
kind: complex-type
url: http://hl7.org/fhir/StructureDefinition/codesystem-effectiveDate
base: http://hl7.org/fhir/StructureDefinition/Extension
version: 4.4.0
required: [value, valueDate]