I defined the job parameter in job using {{job.start_time.[iso_datetime]}} and then I added the lines you suggested in notebook but getting an error "com.databricks.dbutils_v1.InputWidgetNotDefined: No input widget named iso_datetime is defined"

import datetime
iso_datetime: str = dbutils.widgets.get("iso_datetime")
date_object = datetime.datetime.strptime(iso_datetime, "%Y-%m-%dT%H:%M:%S.%f")
print(date_object.year, date_object.month, date_object.day)