{"abstract":false,"baseDefinition":"http://hl7.org/fhir/StructureDefinition/DataType","contact":[{"telecom":[{"system":"url","value":"http://hl7.org/fhir"}]},{"telecom":[{"system":"url","value":"http://www.hl7.org/Special/committees/fiwg"}]}],"date":"2026-03-29T21:54:20+00:00","derivation":"specialization","description":"Period Type: A time period defined by a start and end date and optionally time.","differential":{"element":[{"comment":"A Period specifies a range of time; the context of use will specify whether the entire range applies (e.g. \"the patient was an inpatient of the hospital for this time range\") or one value from the range applies (e.g. \"give to the patient between these two times\").\n\nPeriod is not used for a duration (a measure of elapsed time). See [Duration](datatypes.html#Duration).","constraint":[{"expression":"start.hasValue().not() or end.hasValue().not() or (start.lowBoundary() <= end.highBoundary())","human":"If present, start SHALL have a lower or equal value than end","key":"per-1","severity":"error","source":"http://hl7.org/fhir/StructureDefinition/Period"}],"definition":"A time period defined by a start and end date and optionally time.","id":"Period","mapping":[{"identity":"v2","map":"DR"},{"identity":"rim","map":"IVL[lowClosed=\"true\" and highClosed=\"true\"] or URG[lowClosed=\"true\" and highClosed=\"true\"]"}],"max":"*","min":0,"path":"Period","short":"Time range defined by start and end date/time"},{"comment":"If the low element is missing, the meaning is that the low boundary is not known.","condition":["per-1"],"definition":"The start of the period. The boundary is inclusive.","id":"Period.start","isSummary":true,"mapping":[{"identity":"v2","map":"DR.1"},{"identity":"rim","map":"./low"}],"max":"1","min":0,"path":"Period.start","short":"Starting time with inclusive boundary","type":[{"code":"dateTime"}]},{"comment":"The end value includes any matching date/time. i.e. 2012-02-03T10:00:00 is in a period that has an end value of 2012-02-03.","condition":["per-1"],"definition":"The end of the period. If the end of the period is missing, it means no end was known or planned at the time the instance was created. The start may be in the past, and the end date in the future, which means that period is expected/planned to end at that time.","id":"Period.end","isSummary":true,"mapping":[{"identity":"v2","map":"DR.2"},{"identity":"rim","map":"./high"}],"max":"1","meaningWhenMissing":"If the end of the period is missing, it means that the period is ongoing","min":0,"path":"Period.end","short":"End time with inclusive boundary, if not ongoing","type":[{"code":"dateTime"}]}]},"experimental":false,"extension":[{"url":"http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status","valueCode":"normative"},{"url":"http://hl7.org/fhir/StructureDefinition/structuredefinition-wg","valueCode":"fhir"}],"fhirVersion":"6.0.0-ballot4","id":"Period","jurisdiction":[{"coding":[{"code":"001","display":"World","system":"http://unstats.un.org/unsd/methods/m49/m49.htm"}]}],"kind":"complex-type","mapping":[{"identity":"v2","name":"HL7 V2 Mapping","uri":"http://hl7.org/v2"},{"identity":"rim","name":"RIM Mapping","uri":"http://hl7.org/v3"}],"name":"Period","publisher":"HL7 International / FHIR Infrastructure","resourceType":"StructureDefinition","snapshot":{"element":[{"base":{"max":"*","min":0,"path":"Period"},"comment":"A Period specifies a range of time; the context of use will specify whether the entire range applies (e.g. \"the patient was an inpatient of the hospital for this time range\") or one value from the range applies (e.g. \"give to the patient between these two times\").\n\nPeriod is not used for a duration (a measure of elapsed time). See [Duration](datatypes.html#Duration).","constraint":[{"expression":"hasValue() or (children().count() > id.count())","human":"All FHIR elements must have a @value or children","key":"ele-1","severity":"error","source":"http://hl7.org/fhir/StructureDefinition/Element"},{"expression":"start.hasValue().not() or end.hasValue().not() or (start.lowBoundary() <= end.highBoundary())","human":"If present, start SHALL have a lower or equal value than end","key":"per-1","severity":"error","source":"http://hl7.org/fhir/StructureDefinition/Period"}],"definition":"A time period defined by a start and end date and optionally time.","id":"Period","isModifier":false,"mapping":[{"identity":"rim","map":"n/a,IVL[lowClosed=\"true\" and highClosed=\"true\"] or URG[lowClosed=\"true\" and highClosed=\"true\"]"},{"identity":"v2","map":"DR"}],"max":"*","min":0,"path":"Period","short":"Time range defined by start and end date/time"},{"base":{"max":"1","min":0,"path":"Element.id"},"condition":["ele-1"],"definition":"Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.","id":"Period.id","isModifier":false,"isSummary":false,"mapping":[{"identity":"rim","map":"n/a"}],"max":"1","min":0,"path":"Period.id","representation":["xmlAttr"],"short":"Unique id for inter-element referencing","type":[{"code":"http://hl7.org/fhirpath/System.String","extension":[{"url":"http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type","valueUrl":"string"}]}]},{"alias":["extensions","user content"],"base":{"max":"*","min":0,"path":"Element.extension"},"comment":"There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.","constraint":[{"expression":"hasValue() or (children().count() > id.count())","human":"All FHIR elements must have a @value or children","key":"ele-1","severity":"error","source":"http://hl7.org/fhir/StructureDefinition/Element"}],"definition":"May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.","id":"Period.extension","isModifier":false,"isSummary":false,"mapping":[{"identity":"rim","map":"n/a"}],"max":"*","min":0,"path":"Period.extension","short":"Additional content defined by implementations","slicing":{"description":"Extensions are always sliced by (at least) url","discriminator":[{"path":"url","type":"value"}],"rules":"open"},"type":[{"code":"Extension"}]},{"base":{"max":"1","min":0,"path":"Period.start"},"comment":"If the low element is missing, the meaning is that the low boundary is not known.","condition":["per-1"],"constraint":[{"expression":"hasValue() or (children().count() > id.count())","human":"All FHIR elements must have a @value or children","key":"ele-1","severity":"error","source":"http://hl7.org/fhir/StructureDefinition/Element"}],"definition":"The start of the period. The boundary is inclusive.","id":"Period.start","isModifier":false,"isSummary":true,"mapping":[{"identity":"v2","map":"DR.1"},{"identity":"rim","map":"./low"}],"max":"1","min":0,"path":"Period.start","short":"Starting time with inclusive boundary","type":[{"code":"dateTime"}]},{"base":{"max":"1","min":0,"path":"Period.end"},"comment":"The end value includes any matching date/time. i.e. 2012-02-03T10:00:00 is in a period that has an end value of 2012-02-03.","condition":["per-1"],"constraint":[{"expression":"hasValue() or (children().count() > id.count())","human":"All FHIR elements must have a @value or children","key":"ele-1","severity":"error","source":"http://hl7.org/fhir/StructureDefinition/Element"}],"definition":"The end of the period. If the end of the period is missing, it means no end was known or planned at the time the instance was created. The start may be in the past, and the end date in the future, which means that period is expected/planned to end at that time.","id":"Period.end","isModifier":false,"isSummary":true,"mapping":[{"identity":"v2","map":"DR.2"},{"identity":"rim","map":"./high"}],"max":"1","meaningWhenMissing":"If the end of the period is missing, it means that the period is ongoing","min":0,"path":"Period.end","short":"End time with inclusive boundary, if not ongoing","type":[{"code":"dateTime"}]}]},"status":"active","text":{"div":"
\r\n\r\n\r\n
NameFlagsCard.TypeDescription & Constraints\"doco\"
\".\"\".\" PeriodΣNElementTime range defined by start and end date/time
+ Rule: If present, start SHALL have a lower or equal value than end

Elements defined in Ancestors: id, extension
\".\"\".\"\".\" startΣC0..1dateTimeStarting time with inclusive boundary
\".\"\".\"\".\" endΣC0..1dateTimeEnd time with inclusive boundary, if not ongoing

\"doco\" Documentation for this format
","status":"generated"},"type":"Period","url":"http://hl7.org/fhir/StructureDefinition/Period","version":"6.0.0-ballot4"}