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

(for VisitDetail:) The date and time of the visit started.

(for DoseEra:) The start date for the drug era constructed from the individual instances of drug exposures. It is the start date of the very first chronologically recorded instance of utilization of a drug.

(for DrugEra:) The start date for the Drug Era constructed from the individual instances of Drug Exposures. It is the start date of the very first chronologically recorded instance of conutilization of a Drug.

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

(for ConditionEra:) The start date for the Condition Era constructed from the individual instances of Condition Occurrences. It is the start date of the very first chronologically recorded instance of the condition.

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

(for VisitOccurrence:) The date and time of the visit started.

condition_occurrence.condition_start_datetime#16 AS datetime

dose_era.dose_era_start_datetime#266 AS date

device_exposure.device_exposure_start_datetime#32 AS datetime

drug_era.drug_era_start_datetime#271 AS date

visit_occurrence.visit_start_datetime#242 AS datetime

condition_era.condition_era_start_datetime#258 AS date

visit_detail.visit_detail_start_datetime#223 AS datetime

drug_exposure.drug_exposure_start_datetime#47 AS datetime