code: def get_file_timestamp(self, key):
      time_updated = False
      try:
          obj = self.client.head_object(Bucket=self.bucket, Key=key)
          time_updated = obj.get("LastModified", None)
      except botocore.exceptions.ClientError as exc:
          if self._not_found(exc.response):
              self.logger.debug(
                  "No key found: {0}/{1}. Cannot get timestamp.".format(
                      self.bucket, key
                  )
              )
          else:
              self.logger.error(
                  "FAILED to get timestamp for S3 object {0}/{1}".format(
                      self.bucket, key
                  )
              )
          return None
      except BaseException:
          util.check_for_kb_interrupt()
          self.logger.error(
              "FAILED to get timestamp for S3 object {0}/{1}".format(
                  self.bucket, key
              )
          )
          return None
  
      if time_updated:
          timestamp = calendar.timegm(time_updated.timetuple())
          return timestamp
      else:
          return None
  
imports: import calendar
  import os
  from urllib.parse import urlparse
  from boto3.s3.transfer import TransferConfig
  from boto3.session import Session
  import botocore
  from botocore.client import Config
  from botocore.handlers import set_list_objects_encoding_type_url
  from typing import Dict
  import re
  from studio.util import logs
  from studio.util import util
  from studio.credentials.credentials import Credentials, AWS_TYPE
  from studio.storage.storage_handler import StorageHandler
  from studio.storage.storage_type import StorageType
  from studio.storage.storage_setup import get_storage_verbose_level
label_desc: Use image node_id 13 for calling the S3StorageHandler obj's underlying member method code with example usage: obj.get_file_timestamp(key) and returns: timestamp, None, None, None