FHIR Extensions Pack
5.4.0 - May 2026 International flag

FHIR Extensions Pack, published by HL7 International / FHIR Infrastructure. This guide is not an authorized publication; it is the continuous build for version 5.4.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/fhir-extensions/ and changes regularly. See the Directory of published versions

ValueSet: Common UCUM Codes for Time Duration

Official URL: http://hl7.org/fhir/ValueSet/time-duration-units Version: 5.4.0
Standards status: Trial-use Maturity Level: 1 Computable Name: CommonUCUMCodesForTimeDuration
Other Identifiers: OID:2.16.840.1.113883.4.642.40.97.48.16

Copyright/Legal: The UCUM codes, UCUM table (regardless of format), and UCUM Specification are copyright © 1999-2009, Regenstrief Institute, Inc. and the Unified Codes for Units of Measures (UCUM) Organization. All rights reserved.

This value set includes all common UCUM codes used for Time Duration Units - 'a' (years), 'mo' (months), 'd' (days), 'h' (hours), 'min' (minutes), 's' (seconds), and 'ms' (milliseconds). NOTE: This value set is the same as the duration units value set, except that it does not include weeks, because weeks are not a valid precision for a datetime, time, or instant value.

References

Changes since version 5.3.0:

  • One or more text definitions/displays have changed

    • Logical Definition (CLD)

    • Include these codes as defined in http://unitsofmeasure.org version Not Stated (use latest from terminology server)
      CodeDisplay
      ms Removedmilliseconds
      s Removedseconds
      min Removedminutes
      h Removedhours
      d Removeddays
      mo Removedmonths
      a Removedyears

     

    Expansion

    Expansion from tx.fhir.org based on codesystem UCUM v2.2 (CodeSystem)

    This value set contains 7 concepts

    SystemCodeDisplay (en)JSONXML
    http://unitsofmeasure.org  msms
    http://unitsofmeasure.org  ss
    http://unitsofmeasure.org  minmin
    http://unitsofmeasure.org  hh
    http://unitsofmeasure.org  dd
    http://unitsofmeasure.org  momo
    http://unitsofmeasure.org  aa

    Description of the above table(s).