Date
extension Date- 
                  
                  Returns a date formatted String that can be used for server communication DeclarationSwift public var isoFormattedDateString: String { get }
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                  Returns a date string in one of the allowed FHIR formats DeclarationSwift public func fhirFormattedString(with format: FHIRDateFormatter.DateFormats) -> StringParametersformatdate format that should be used Return Valuestring representation of self in the specified format
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           Date Extension Reference
      Date Extension Reference