drug exposure temporal region drug exposure start datetime "This is not required, though it is in v6. If a source does not specify datetime the convention is to set the time to midnight (00:00:0000)." http://ohdsi.github.io/CommonDataModel/cdm54.html#DRUG_EXPOSURE http://ohdsi.github.io/CommonDataModel/cdm54.html#DRUG_EXPOSURE The date and time on which a drug exposure starts. Oliver He, Long Tran