FHIR Extensions Pack
5.3.0-ballot-tc1 - (September 2025 Ballot) International flag

This page is part of the FHIR Core Extensions Registry (v5.3.0-ballot-tc1: Release 5.3) based on FHIR (HL7® FHIR® Standard) v5.0.0. This version is a pre-release. The current official version is 5.2.0. For a full list of available versions, see the Directory of published versions

Extension: Time Precision

Official URL: http://hl7.org/fhir/StructureDefinition/time-precision Version: 5.3.0-ballot-tc1
Standards status: Trial-use Maturity Level: 1 Computable Name: TimePrecision

Specifies that the precision of the datetime, time, or instant value is less than what appears and indicates the actual level of precision. This extension is used when the precision of a datetime, time, or instant value is not conveyed by the value itself (e.g. the datetime value 2014-02-01T10:00:00Z has a precision of 'min' and actually represents "10:00" and unknown seconds on Feb 1, 2014.

Context of Use

This extension may be used on the following element(s)

Usage info

Usages:

  • This Extension is not used by any profiles in this Implementation Guide

You can also check for usages in the FHIR IG Statistics

Changes since version 5.2.0:

  • New Content

    • Formal Views of Extension Content

    Description of Profiles, Differentials, Snapshots, and how the XML and JSON presentations work.

    This structure is derived from Extension

    Summary

    Simple Extension with the type code: Specifies that the precision of the datetime, time, or instant value is less than what appears and indicates the actual level of precision. This extension is used when the precision of a datetime, time, or instant value is not conveyed by the value itself (e.g. the datetime value 2014-02-01T10:00:00Z has a precision of 'min' and actually represents "10:00" and unknown seconds on Feb 1, 2014.

    Maturity: 1

    This structure is derived from Extension

    NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
    .. Extension 0..1 Extension Explicit precision (h, min, s)
    ... extension 0..0
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/time-precision"
    ... value[x] 1..1 code Value of extension
    Binding: CommonUCUMCodesForTimeDuration (required): Time duration units

    doco Documentation for this format
    NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
    .. Extension 0..1 Extension Explicit precision (h, min, s)
    ... id 0..1 id Unique id for inter-element referencing
    ... extension 0..0
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/time-precision"

    doco Documentation for this format

    This structure is derived from Extension

    Summary

    Simple Extension with the type code: Specifies that the precision of the datetime, time, or instant value is less than what appears and indicates the actual level of precision. This extension is used when the precision of a datetime, time, or instant value is not conveyed by the value itself (e.g. the datetime value 2014-02-01T10:00:00Z has a precision of 'min' and actually represents "10:00" and unknown seconds on Feb 1, 2014.

    Maturity: 1

    Differential View

    This structure is derived from Extension

    NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
    .. Extension 0..1 Extension Explicit precision (h, min, s)
    ... extension 0..0
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/time-precision"
    ... value[x] 1..1 code Value of extension
    Binding: CommonUCUMCodesForTimeDuration (required): Time duration units

    doco Documentation for this format

    Snapshot View

    NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
    .. Extension 0..1 Extension Explicit precision (h, min, s)
    ... id 0..1 id Unique id for inter-element referencing
    ... extension 0..0
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/time-precision"

    doco Documentation for this format

     

    Other representations of profile: CSV, Excel, Schematron

    Terminology Bindings

    PathConformanceValueSetURI
    Extension.value[x]requiredCommonUCUMCodesForTimeDuration
    http://hl7.org/fhir/ValueSet/time-duration-units
    From this IG

    Constraints

    IdGradePath(s)DetailsRequirements
    ele-1error**ALL** elementsAll FHIR elements must have a @value or children
    : hasValue() or (children().count() > id.count())
    ext-1error**ALL** extensionsMust have either extensions or value[x], not both
    : extension.exists() != value.exists()

    R4B

    The extension is unchanged in R4B

    R4

    The extension is unchanged in R4

    R3

    The extension is unchanged in R3

    Search Parameters for this Extension

    (none found)