code: function(index, datasetIndex) {
  		var me = this;
  		var timestamps = me._timestamps;
  		var time = timestamps.datasets[datasetIndex][index];
  		var value;
  
  		if (helpers.isNullOrUndef(time)) {
  			value = me.chart.data.datasets[datasetIndex].data[index];
  			if (helpers.isObject(value)) {
  				time = parse(me, value);
  			} else {
  				time = parse(me, timestamps.labels[index]);
  			}
  		}
  
  		return time;
  	}
docs: /*
  @private