docs: def get_nanopubstore_start_dt(url: str):
      """Get last start_dt recorded for getting new nanopub ID's"""
  
      hostname = urllib.parse.urlsplit(url)[1]
  
      start_dates_doc = state_mgmt.get(start_dates_doc_key)
      if start_dates_doc and start_dates_doc.get("start_dates"):
          date = [
              dt["start_dt"]
              for dt in start_dates_doc["start_dates"]
              if dt["nanopubstore"] == hostname
          ]
          log.info(f"Selected start_dt: {date}  len: {len(date)}")
          if len(date) == 1:
              return date[0]
  
      return "1900-01-01T00:00:00.000Z"