NP Core Implementation Guide
1.0.0 - Release
NP Core Implementation Guide
1.0.0 - Release
NP Core Implementation Guide - Local Development build (v1.0.0) built by the FHIR (HL7® FHIR® Standard) Build Tools. See the Directory of published versions
| Active as of 2026-10-14 |
Definitions for the np-core-bikram-sambat-date extension
See the documentation on how to interpret the contents of this table
| 0. Extension | |
| Definition | Carries the original Bikram Sambat (BS) date captured by the source system, as a numeric string in YYYY, YYYY-MM or YYYY-MM-DD form. It may be used on any date or dateTime element; it is deliberately not available on instant, which records a machine timestamp rather than a calendar date a person entered. The Gregorian (AD) element this extension is attached to remains the value of record; this extension only preserves the original BS capture for display and audit. FHIR cannot validate agreement between the two calendars, so keeping the BS value consistent with the Gregorian value is the responsibility of the capturing system. Populate this extension only where a faithful Bikram Sambat capture exists; never derive it and never use it in place of the Gregorian value. The precision of the BS value SHOULD match the precision of the Gregorian element, since a year-only birth year is a common and legitimate capture for elderly patients. There is deliberately no separate Bikram Sambat dateTime form: Bikram Sambat is a calendar with no time component, so on elements that carry a dateTime this extension records only the BS calendar date and the time of day lives solely in the Gregorian value. Where the Gregorian value carries a time, the BS date SHALL correspond to the Asia/Kathmandu local date of that instant rather than its UTC date, because the two can fall on different days across midnight. Optional Extension Element - found in all resources. |
| Short | Bikram Sambat DateOptional Extensions Element |
| Control | 0..* This element is affected by the following invariants: ele-1 |
| Is Modifier | false |
| Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both ( extension.exists() != value.exists())ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists()) |
| 2. Extension.extension | |
| Definition | An Extension 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 manageable, 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. |
| Short | ExtensionAdditional content defined by implementations |
| Comments | 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. |
| Control | 0..0* |
| Type | Extension |
| Is Modifier | false |
| Summary | false |
| Alternate Names | extensions, user content |
| Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists()) |
| Slicing | This element introduces a set of slices on Extension.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:Slicing Note: The rules on this element (including its children) apply to all the slices, but are not repeated in them |
| 4. Extension.url | |
| Definition | Source of the definition for the extension code - a logical name or a URL. |
| Short | identifies the meaning of the extension |
| Comments | The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension. |
| Control | 1..1 |
| Type | uri |
| Is Modifier | false |
| XML Format | In the XML format, this property is represented as an attribute. |
| Summary | false |
| Fixed Value | http://fhir.digitalhealth.gov.np/core/StructureDefinition/np-core-bikram-sambat-date |
| 6. Extension.value[x] | |
| Definition | Value of extension - must be one of a constrained set of the data types (see Extensibility for a list). |
| Short | Original Bikram Sambat date as YYYY, YYYY-MM or YYYY-MM-DDValue of extension |
| Control | 10..1 |
| Type | string, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, Coding, SampledData, id, positiveInt, Distance, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, CodeableConcept, ParameterDefinition, dateTime, code, Contributor, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, Signature, unsignedInt, time |
| [x] Note | SeeChoice of Data Typesfor further information about how to use [x] |
| Is Modifier | false |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| Summary | false |
| Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) np-bs-1: A Bikram Sambat date SHALL be a numeric string in YYYY, YYYY-MM or YYYY-MM-DD form. Days run to 32 because Bikram Sambat months vary between 29 and 32 days. ( $this.matches('^[12][0-9]{3}(-(0[1-9]|1[0-2])(-(0[1-9]|[12][0-9]|3[0-2]))?)?$')) |
See the documentation on how to interpret the contents of this table
| 0. Extension | |
| Definition | Carries the original Bikram Sambat (BS) date captured by the source system, as a numeric string in YYYY, YYYY-MM or YYYY-MM-DD form. It may be used on any date or dateTime element; it is deliberately not available on instant, which records a machine timestamp rather than a calendar date a person entered. The Gregorian (AD) element this extension is attached to remains the value of record; this extension only preserves the original BS capture for display and audit. FHIR cannot validate agreement between the two calendars, so keeping the BS value consistent with the Gregorian value is the responsibility of the capturing system. Populate this extension only where a faithful Bikram Sambat capture exists; never derive it and never use it in place of the Gregorian value. The precision of the BS value SHOULD match the precision of the Gregorian element, since a year-only birth year is a common and legitimate capture for elderly patients. There is deliberately no separate Bikram Sambat dateTime form: Bikram Sambat is a calendar with no time component, so on elements that carry a dateTime this extension records only the BS calendar date and the time of day lives solely in the Gregorian value. Where the Gregorian value carries a time, the BS date SHALL correspond to the Asia/Kathmandu local date of that instant rather than its UTC date, because the two can fall on different days across midnight. |
| Short | Bikram Sambat Date |
| 2. Extension.extension | |
| Control | 0..0 |
| 4. Extension.url | |
| Fixed Value | http://fhir.digitalhealth.gov.np/core/StructureDefinition/np-core-bikram-sambat-date |
| 6. Extension.value[x] | |
| Short | Original Bikram Sambat date as YYYY, YYYY-MM or YYYY-MM-DD |
| Control | 1..? |
| Type | string, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, Coding, SampledData, id, positiveInt, Distance, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, CodeableConcept, ParameterDefinition, dateTime, code, Contributor, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, Signature, unsignedInt, time |
| [x] Note | SeeChoice of Data Typesfor further information about how to use [x] |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| Invariants | np-bs-1: A Bikram Sambat date SHALL be a numeric string in YYYY, YYYY-MM or YYYY-MM-DD form. Days run to 32 because Bikram Sambat months vary between 29 and 32 days. ($this.matches('^[12][0-9]{3}(-(0[1-9]|1[0-2])(-(0[1-9]|[12][0-9]|3[0-2]))?)?$')) |
See the documentation on how to interpret the contents of this table
| 0. Extension | |
| Definition | Carries the original Bikram Sambat (BS) date captured by the source system, as a numeric string in YYYY, YYYY-MM or YYYY-MM-DD form. It may be used on any date or dateTime element; it is deliberately not available on instant, which records a machine timestamp rather than a calendar date a person entered. The Gregorian (AD) element this extension is attached to remains the value of record; this extension only preserves the original BS capture for display and audit. FHIR cannot validate agreement between the two calendars, so keeping the BS value consistent with the Gregorian value is the responsibility of the capturing system. Populate this extension only where a faithful Bikram Sambat capture exists; never derive it and never use it in place of the Gregorian value. The precision of the BS value SHOULD match the precision of the Gregorian element, since a year-only birth year is a common and legitimate capture for elderly patients. There is deliberately no separate Bikram Sambat dateTime form: Bikram Sambat is a calendar with no time component, so on elements that carry a dateTime this extension records only the BS calendar date and the time of day lives solely in the Gregorian value. Where the Gregorian value carries a time, the BS date SHALL correspond to the Asia/Kathmandu local date of that instant rather than its UTC date, because the two can fall on different days across midnight. |
| Short | Bikram Sambat Date |
| Control | 0..* This element is affected by the following invariants: ele-1 |
| Is Modifier | false |
| Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))ext-1: Must have either extensions or value[x], not both ( extension.exists() != value.exists()) |
| 2. Extension.id | |
| Definition | Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces. |
| Short | Unique id for inter-element referencing |
| Control | 0..1 |
| Type | string |
| Is Modifier | false |
| XML Format | In the XML format, this property is represented as an attribute. |
| Summary | false |
| 4. Extension.extension | |
| Definition | An Extension |
| Short | Extension |
| Control | 0..0 |
| Type | Extension |
| Is Modifier | false |
| Summary | false |
| Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))ext-1: Must have either extensions or value[x], not both ( extension.exists() != value.exists()) |
| Slicing | This element introduces a set of slices on Extension.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:Slicing Note: The rules on this element (including its children) apply to all the slices, but are not repeated in them |
| 6. Extension.url | |
| Definition | Source of the definition for the extension code - a logical name or a URL. |
| Short | identifies the meaning of the extension |
| Comments | The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension. |
| Control | 1..1 |
| Type | uri |
| Is Modifier | false |
| XML Format | In the XML format, this property is represented as an attribute. |
| Summary | false |
| Fixed Value | http://fhir.digitalhealth.gov.np/core/StructureDefinition/np-core-bikram-sambat-date |
| 8. Extension.value[x] | |
| Definition | Value of extension - must be one of a constrained set of the data types (see Extensibility for a list). |
| Short | Original Bikram Sambat date as YYYY, YYYY-MM or YYYY-MM-DD |
| Control | 1..1 |
| Type | string |
| [x] Note | SeeChoice of Data Typesfor further information about how to use [x] |
| Is Modifier | false |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| Summary | false |
| Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))np-bs-1: A Bikram Sambat date SHALL be a numeric string in YYYY, YYYY-MM or YYYY-MM-DD form. Days run to 32 because Bikram Sambat months vary between 29 and 32 days. ( $this.matches('^[12][0-9]{3}(-(0[1-9]|1[0-2])(-(0[1-9]|[12][0-9]|3[0-2]))?)?$')) |