diff --git a/src/game/license_timer/chart.js b/src/game/license_timer/chart.js
index f634dc1..a86338b 100644
--- a/src/game/license_timer/chart.js
+++ b/src/game/license_timer/chart.js
@@ -97,7 +97,7 @@ Chart.prototype.printChartRecord = function(chartRecordIndex, scoreListIndex) {
 		this.recordTexts[chartRecordIndex].printGrade("-");
 		this.recordTexts[chartRecordIndex].printSubject("-");
 	} else {
-		this.recordTexts[chartRecordIndex].printDate(StringUtil.printMonthDay(this.scoreList[scoreListIndex].date));
+		this.recordTexts[chartRecordIndex].printDate(DateUtil.printMonthDay(this.scoreList[scoreListIndex].date));
 
 		var scoreValue = RecordUtil.getRecordValueWithUnit(this.scoreList[scoreListIndex].score, 101);
 		this.recordTexts[chartRecordIndex].printScore(scoreValue);
diff --git a/src/web/client/license_timer.html b/src/web/client/license_timer.html
index 80deadd..8477c2e 100644
--- a/src/web/client/license_timer.html
+++ b/src/web/client/license_timer.html
@@ -43,6 +43,7 @@
 		<script src="../../game/lib/util/number_util.js"></script>
 		<script src="../../game/lib/util/string_util.js"></script>
 		<script src="../../game/lib/util/record_util.js"></script>
+		<script src="../../game/lib/util/date_util.js"></script>
 
 		<script src="../../game/lib/text/input_type_text.js?update_date=191224"></script>
 		<script src="../../game/lib/text/screen_top_ui.js?update_date=191224"></script>