code: def find(cls, *args, **kwargs):
          
          seconds = 60 * 60 * 24 * 30  # seconds in 30 days
          until = kwargs.pop('until', None)
          since = kwargs.pop('since', None)
  
          if until is None:
              until = datetime.datetime.now()
  
          if since is None:
              since = until - datetime.timedelta(seconds=seconds)
  
          dt = until - since
          if dt > datetime.timedelta(seconds=seconds):
              raise InvalidArguments(until, since)
  
          kwargs['since'] = since.isoformat()
          kwargs['until'] = until.isoformat()
  
          return getattr(Entity, 'find').__func__(cls, *args, **kwargs)
docs: Find notifications.
  
          Optional kwargs are:
              since:
                  datetime instance
              until:
                  datetime instance
  
          If not specified, until will default to now(), and since will default
          to 30 days prior to until.
  
          As per PD spec, date range must not exceed 1 month.