description: An IANA timezone code for  the timezone offset per [BCP 175](https://www.iana.org/go/rfc6557). The offset is specified as part of a dateTime/instant (or using the tzOffset extension on a date if necessary). The timezone code may also be provided to allow for human display of the location associated with the offset.
package_name: hl7.fhir.core
derivation: constraint
name: Timezone Code
type: Extension
elements:
  extension: {index: 0}
  url:
    type: uri
    pattern: {type: Uri, value: 'http://hl7.org/fhir/StructureDefinition/tz-code'}
    index: 1
  valueCode:
    type: code
    binding: {strength: required, valueSet: 'http://hl7.org/fhir/ValueSet/timezones'}
    index: 2
package_version: 3.5.0
extensions: {}
class: extension
kind: complex-type
url: http://hl7.org/fhir/StructureDefinition/tz-code
base: http://hl7.org/fhir/StructureDefinition/Extension
version: null