code: def _microseconds_from_datetime(value):
      
      if not value.tzinfo:
          value = value.replace(tzinfo=UTC)
      # Regardless of what timezone is on the value, convert it to UTC.
      value = value.astimezone(UTC)
      # Convert the datetime to a microsecond timestamp.
      return int(calendar.timegm(value.timetuple()) * 1e6) + value.microsecond
docs: Convert non-none datetime to microseconds.
  
      :type value: :class:`datetime.datetime`
      :param value: The timestamp to convert.
  
      :rtype: int
      :returns: The timestamp, in microseconds.