docs: def fromJavascript(cls, javascript_datetime):
  
          ''' a method to construct labDT from a javascript datetime string
          
          :param javascript_datetime: string with datetime info in javascript formatting
          :return: labDT object
          '''
  
      # validate inputs
          title = 'Javascript datetime string input for labDT.fromJavascript'
          jsDTpattern = re.compile('\s*\(.*\)$')
          jsGMTpattern = re.compile('GMT[-\+]\d{4}')
          if not jsGMTpattern.findall(javascript_datetime):
              raise Exception('\n%s must have a GMT timezone adjustment.' % title)
  
      # construct datetime from javascript string
          adj_input = jsDTpattern.sub('', javascript_datetime)
          if '-' in adj_input:
              adj_input = adj_input.replace('-','+')
          elif '+' in adj_input:
              adj_input = adj_input.replace('+','-')
          python_datetime = dTparser.parse(adj_input)
          dT = python_datetime.astimezone(pytz.utc)
          dt_kwargs = {
              'year': dT.year,
              'month': dT.month,
              'day': dT.day,
              'hour': dT.hour,
              'minute': dT.minute,
              'second': dT.second,
              'microsecond': dT.microsecond,
              'tzinfo': dT.tzinfo
          }
          return labDT(**dt_kwargs)