(for DrugExposure:) The start date for the current instance of Drug utilization. Valid entries include a start date of a prescription, the date a prescription was filled, or the date on which a Drug administration procedure was recorded.

(for Cohort:) The date when the Cohort Definition criteria for the Person, Provider or Visit first match.

(for ObservationPeriod:) The start date of the observation period for which data are available from the data source.

(for LocationHistory:) The date the relationship started.

(for PayerPlanPeriod:) The start date of the payer plan period.

(for DeviceExposure:) The date the Device or supply was applied or used.

(for VisitDetail:) The start date of the visit.

(for VisitOccurrence:) The start date of the visit.

(for ConditionOccurrence:) The date when the instance of the Condition is recorded.

cohort.cohort_start_date#3 AS date

condition_occurrence.condition_start_date#15 AS date

visit_detail.visit_detail_start_date#222 AS date

drug_exposure.drug_exposure_start_date#46 AS date

visit_occurrence.visit_start_date#241 AS date

location_history.start_date#335 AS date

payer_plan_period.payer_plan_period_start_date#296 AS date

device_exposure.device_exposure_start_date#31 AS date

observation_period.observation_period_start_date#144 AS date