text: from datetime import datetime
  
  from dateutil.parser import parser
  
  
  def get_iso_timestamp_from_string(timestamp_string):
      return parser().parse(timestamp_string).strftime("%Y-%m-%dT%H:%M:%SZ")
  
  
  def get_iso_timestamp_from_unix_timestamp(unix_timestamp):
      return datetime.utcfromtimestamp((int(unix_timestamp))).strftime("%Y-%m-%dT%H:%M:%SZ")
  