code: function getLastKnownUpdatedAt() {
          
          return Platform.async(function(callback) {
              callback();
          })().then(function() {
              
              if (pullQueryId) { // read lastKnownUpdatedAt from the store
                  return store.lookup(pulltimeTableName, pullQueryId, true /* suppressRecordNotFoundError */);
              }
  
          }).then(function(result) {
  
              if (result) {
                  return result.value;
              }
  
              return new Date (1970, 0, 0);
          });
      }
docs: Gets the last known updatedAt timestamp. For incremental pull, we check if we have any information about it in the store. If not we simply use 1970 to start the sync operation, just like a non-incremental / vanilla pull.