code: def zulu(self):
  
          ''' a method to report ISO UTC datetime string from a labDT object
  
          NOTE: for timezone offset string use .isoformat() instead
  
          :return: string in ISO UTC format
          '''
  
      # construct ISO UTC string from labDT
          utc_dt = self.astimezone(pytz.utc)
          iso_dt = utc_dt.isoformat()
          return iso_dt.replace('+00:00', 'Z'f zulu(self):
  
          ''' a method to report ISO UTC datetime string from a labDT object
  
          NOTE: for timezone offset string use .isoformat() instead
  
          :return: string in ISO UTC format
          '''
  
      # construct ISO UTC string from labDT
          utc_dt = self.astimezone(pytz.utc)
          iso_dt = utc_dt.isoformat()
          return iso_dt.replace('+00:00', 'Z')
docs: a method to report ISO UTC datetime string from a labDT object
  
          NOTE: for timezone offset string use .isoformat() instead
  
          :return: string in ISO UTC format