code: def date_to_nsec_from_epoch(dt):
      return timegm(dt.timetuple()) * 1000000000
  
imports: import datetime
  import sys
  import warnings
  from calendar import timegm
  from collections import OrderedDict, namedtuple
  from decimal import Decimal
  import numpy
  import tensorflow.compat.v1
label_desc: Use image node_id 1 for calling a global function with example usage: date_to_nsec_from_epoch(dt) and returns: unknown