dateTimePrecision
A keyword identifying a singular date/time precision unit. Used in duration calculations, component extraction, and interval operator phrases to specify the granularity of a temporal operation.
Examples
Year precision in a duration calculation
duration in years of "Measurement Period"
Month precision in a same-as comparison
Encounter.period same month as "Measurement Period"
Day precision in an offset
MedStart 30 days before start of Encounter.period
Minute precision in a within comparison
Procedure.performed within 30 minutes of Encounter.period
EBNF
dateTimePrecision : 'year' | 'month' | 'week' | 'day' | 'hour' | 'minute' | 'second' | 'millisecond' ;