diff --git a/src/game/lib/chart.js b/src/game/lib/chart.js
index 05dfbdf..639bfb7 100644
--- a/src/game/lib/chart.js
+++ b/src/game/lib/chart.js
@@ -15,7 +15,7 @@ Chart.prototype.drawRecordGraph = function(index, date, bestRecord, min, max) {
 
 	this.drawText(
 		posX, posY + Chart.CHART_DATE_OFFSET_Y,
-		date === "-" ? "-" : StringUtil.printMonthDay(date)
+		date === "-" ? "-" : DateUtil.printMonthDay(date)
 	);
 
 	if(bestRecord === "")