Termini

CodeSystemsConceptSystemsStructureDefinitionsValueSetsPackagesConflicts
StructureDefinitionsCodeSystemEffectiveDate

http://hl7.org/fhir/StructureDefinition/codesystem-effectiveDate|5.2.0

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.
StructureJSONDependenciesFHIRSchemaOther VersionsDependant (0)ElementsSummary
Base: http://hl7.org/fhir/StructureDefinition/Extension4.0.1, 5.0.0, 4.0.1
Type: Extension (a.k.a: http://hl7.org/fhir/StructureDefinition/Extension)
Type dependencies: 0
Elements
extension: Extension
id: http://hl7.org/fhirpath/System.String
url: http://hl7.org/fhirpath/System.String
value[x]: date