class_docstr: NetCDF4 reader for VIIRS Active Fires.
class_docstr_tok: ["NetCDF4","reader","for","VIIRS","Active","Fires","."]
docstr: Get first date/time when observations were recorded.
docstr_tok: ["Get","first","date\/time","when","observations","were","recorded","."]
code: def start_time(self):
      """Get first date/time when observations were recorded."""
      return self.filename_info["start_time"]
  
imports: from __future__ import annotations
  import logging
  from typing import Iterable
  import dask.array
  import xarray
  from satpy import DataID
  from satpy.readers.file_handlers import BaseFileHandler
  from satpy.utils import get_chunk_size_limit
label_desc: Use image node_id 7 for calling the VIIRSJRRFileHandler obj's underlying member method code with example usage: obj.start_time() and returns: self