class_docstr: The OLCI reader base.
docstr: Start time property.
docstr_tok: ["Start","time","property","."]
code: def start_time(self):
      """Start time property."""
      return self._start_time
  
imports: import logging
  from functools import reduce
  import dask.array
  import numpy
  import xarray
  from satpy._compat import cached_property
  from satpy.readers import open_file_or_filename
  from satpy.readers.file_handlers import BaseFileHandler
  from satpy.utils import angle2xyz, get_legacy_chunk_size, xyz2angle
label_desc: Use image node_id 3 for calling the NCOLCIBase obj's underlying member method code with example usage: obj.start_time() and returns: self