class_docstr: Reader class for SEVIRI L2 products in GRIB format.
docstr: Return the sensing start time.
docstr_tok: ["Return","the","sensing","start","time","."]
code: def start_time(self):
      """Return the sensing start time."""
      return self.filename_info["start_time"]
  
imports: import logging
  from datetime import timedelta
  import dask.array
  import numpy
  import xarray
  from satpy.readers._geos_area import get_area_definition, get_geos_area_naming
  from satpy.readers.eum_base import get_service_mode
  from satpy.readers.file_handlers import BaseFileHandler
  from satpy.readers.seviri_base import PLATFORM_DICT, REPEAT_CYCLE_DURATION, calculate_area_extent
  from satpy.utils import get_legacy_chunk_size
label_desc: Use image node_id 2 for calling the SeviriL2GribFileHandler obj's underlying member method code with example usage: obj.start_time() and returns: self