Intervals with boundaries of varying precision

[brynrhodes]

library TestPeriodInterval

using FHIR version '4.0.1'

include FHIRHelpers version '4.1.0'

define FHIRPeriod: FHIR.Period { start: dateTime { value: @2024-03-01T01:00:00.000Z }, end: dateTime { value: @2024-03-01T } }

define TestToInterval: FHIRHelpers.ToInterval(FHIRPeriod)

[brynrhodes]

In theory, if the starting boundary is @2024-03-01T00:00:00.000Z, then it's incorrect to say that the ending boundary must be greater than, because it's actually the case that no possible value could be less than the start, but that's only the edge case. The general case with any time greater than the midnight on the same day will result in the same issue.

[brynrhodes]

This is arising from patterns in real data being submitted from hospital systems, so we need a general solution here. The workaround in place for now is to update FHIRHelpers.ToPeriod to account for these possibilities by creating an interval with the ending boundary as the maximum time still on the day.